Remove Bintray upload support for now

There is a known issue with Gradle's new `maven-publish` plugin that
causes all dependencies in the published pom to runtime-scoped [1]. This
causes conflicts with our use of Spring's `propdeps` Gradle plugin that
introduces optional and provided scopes.

This commit drops down to using Gradle's older, orginal `maven` plugin,
and JFrog's old-style `artifactory-publish` plugin in order to preserve
propdeps support.

This means removing JFrog's `bintray` plugin, as it appears to depend on
the `maven-publish` plugin. For the moment, ethereumj only really needs
to publish snapshots, and this is still supported. This is a stopgap
measure; it will be necessary to deal with getting uploads to
Bintray/JCenter working again once we're ready for a non-snapshot
release, but this can be dealt with later.

[1]: http://forums.gradle.org/gradle/topics/maven_publish_plugin_generated_pom_making_dependency_scope_runtime

ethereumj-core/README.md

@@ -59,4 +59,4 @@ Run `../gradlew install`.
 
 #### Publish ethereumj-core builds
 
-Simply push to master, and [the Travis CI build](https://travis-ci.org/ethereum/ethereumj) will take care of the rest. To publish manually instead, just run `../gradlew publish`. Where the artifacts are published depends on the value of the `version` property in the [root build.gradle file](../build.gradle). Snapshots (version values ending in `-SNAPSHOT`) will be published to oss.jfrog.org, while releases will be published to Bintray (and subsequently to JCenter). **You must be a member of the [ethereum Bintray organization](https://bintray.com/ethereum) and you must supply `bintrayUser` and `bintrayKey` properties to the Gradle build in order to authenticate against these repositories**. Configure these properties in your `$HOME/.gradle/gradle.properties` for greatest convenience and security.
+Simply push to master, and [the Travis CI build](https://travis-ci.org/ethereum/ethereumj) will take care of the rest. To publish manually instead, just run `../gradlew publish`. Where the artifacts are published depends on the value of the `version` property in the [root build.gradle file](../build.gradle). Snapshots (version values ending in `-SNAPSHOT`) will be published to oss.jfrog.org. **You must be a member of the [ethereum Bintray organization](https://bintray.com/ethereum) and you must supply `bintrayUser` and `bintrayKey` properties to the Gradle build in order to authenticate against these repositories**. Configure these properties in your `$HOME/.gradle/gradle.properties` for greatest convenience and security.

ethereumj-core/build.gradle

@@ -1,25 +1,24 @@
 buildscript {
     repositories {
-        maven { url 'http://repo.spring.io/plugins-release' }
+        jcenter()
+        maven { url 'http://repo.spring.io/plugins-release-local' }
     }
     dependencies {
         classpath 'org.springframework.build.gradle:propdeps-plugin:0.0.7'
+        classpath 'org.jfrog.buildinfo:build-info-extractor-gradle:3.0.1'
     }
 }
 
 plugins {
     id 'application'
     id 'jacoco'
-    id 'maven'
-    id 'maven-publish'
     id 'com.github.johnrengelman.shadow' version '1.2.0'
     id 'me.champeau.gradle.antlr4' version '0.1'
     id 'com.github.kt3k.coveralls' version '2.0.1x'
-    id 'com.jfrog.artifactory' version '3.0.1'
-    id 'com.jfrog.bintray' version '1.0'
 }
 
 apply plugin: 'propdeps-maven'
+apply plugin: 'com.jfrog.artifactory-upload'
 
 sourceCompatibility = 1.7
 
@@ -115,16 +114,6 @@ jacocoTestReport {
     }
 }
 
-publishing {
-    publications {
-        mavenJava(MavenPublication) {
-            from components.java
-            artifact sourcesJar
-            artifact javadocJar
-        }
-    }
-}
-
 def bintrayUsername = project.hasProperty('bintrayUser') ? project.bintrayUser : ''
 def bintrayPassword = project.hasProperty('bintrayKey') ? project.bintrayKey : ''
 def pullRequest = System.getenv('TRAVIS_PULL_REQUEST')
@@ -137,9 +126,6 @@ artifactory {
             username = bintrayUsername
             password = bintrayPassword
         }
-        defaults {
-            publications ('mavenJava')
-        }
     }
     resolve {
         repository {
@@ -153,36 +139,17 @@ artifactoryPublish.onlyIf {
     (!pullRequest || pullRequest == 'false') && project.version.endsWith('-SNAPSHOT')
 }
 
-bintray {
-    user = bintrayUsername
-    key = bintrayPassword
-
-    publications = ['mavenJava']
-    dryRun = false //Whether to run this as dry-run, without deploying
-    publish = true //If version should be auto published after an upload
-    pkg {
-        userOrg = 'ethereum' //An optional organization name when the repo belongs to one of the user's orgs
-        repo = 'maven'
-        name = 'org.ethereum'
-    }
-}
-
-bintrayUpload.onlyIf {
-    (!pullRequest || pullRequest == 'false') && !project.version.endsWith('-SNAPSHOT')
-}
-
 install {
     repositories.mavenInstaller {
         customizePom(pom, project)
     }
 }
 
-publish {
-    description = "Releases snapshots to oss.jfrog.org and releases to Bintray/JCenter"
-    dependsOn artifactoryPublish, bintrayUpload
+task publish {
+    description = "Publishes snapshots to oss.jfrog.org"
+    dependsOn artifactoryPublish
 }
 
-
 def customizePom(pom, gradleProject) {
     pom.whenConfigured { generatedPom ->
         // eliminate test-scoped dependencies (no need in maven central poms)