Updates to boilerplate and template creation

Update `test` command to run `embark test`
Update `name` in `package.json` to be something more easily replaceable.
Use `sed` to replace above flag with DApp name

boilerplate/package.json

@@ -1,10 +1,9 @@
 {
-  "name": "app_name",
+  "name": "%APP_NAME%",
   "version": "0.0.1",
   "description": "",
-  "main": "Gruntfile.js",
   "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "test": "embark test"
   },
   "author": "",
   "license": "ISC",

lib/cmds/template_generator.js

@@ -11,6 +11,7 @@ TemplateGenerator.prototype.generate = function(destinationFolder, name) {
 
   fs.copySync(templatePath, destinationFolder + name);
   utils.cd(destinationFolder + name);
+  utils.sed('package.json', '%APP_NAME%', name);
 
   console.log('Installing packages.. this can take a few seconds'.green);
   utils.runCmd('npm install');

lib/core/utils.js

@@ -45,6 +45,10 @@ function cd(folder) {
   shelljs.cd(folder);
 }
 
+function sed(file, pattern, replace) {
+  shelljs.sed('-i', pattern, replace, file);
+}
+
 function exit(code) {
   process.exit(code);
 }
@@ -57,6 +61,7 @@ module.exports = {
   checkIsAvailable: checkIsAvailable,
   runCmd: runCmd,
   cd: cd,
+  sed: sed,
   exit: exit
 };