chore(build): use watchify for auto-building

(significant build speedup ahead)

Gruntfile.js

@@ -1,6 +1,7 @@
 module.exports = function(grunt) {
 
   require('load-grunt-tasks')(grunt);
+  require('time-grunt')(grunt);
 
   /* global Buffer,process*/
 
@@ -77,9 +78,27 @@ module.exports = function(grunt) {
           debug: true
         }
       },
+      watch: {
+        options: {
+          alias: [
+            'node_modules/jquery:jquery',
+            'node_modules/lodash:lodash',
+            'node_modules/bpmn-moddle:bpmn/Model',
+            '<%= config.sources %>/main.js:bpmn',
+            '<%= config.sources %>/Viewer.js:bpmn/Viewer',
+            '<%= config.sources %>/Modeler.js:bpmn/Modeler'
+          ],
+          watch: true,
+          keepalive: true
+        },
+        files: {
+          '<%= config.dist %>/bpmn.js': [ '<%= config.sources %>/**/*.js' ],
+          '<%= config.dist %>/bpmn-viewer.js': [ '<%= config.sources %>/lib/Viewer.js' ]
+        }
+      },
       modeler: {
         files: {
-          '<%= config.dist %>/bpmn.js': [ 'shim/*.js', '<%= config.sources %>/**/*.js' ]
+          '<%= config.dist %>/bpmn.js': [ '<%= config.sources %>/**/*.js' ]
         },
         options: {
           alias: [
@@ -121,10 +140,6 @@ module.exports = function(grunt) {
       }
     },
     watch: {
-      sources: {
-        files: [ '<%= config.sources %>/**/*.js' ],
-        tasks: [ 'build:lib' ]
-      },
       samples: {
         files: [ '<%= config.samples %>/**/*.*' ],
         tasks: [ 'build:samples' ]
@@ -227,7 +242,7 @@ module.exports = function(grunt) {
   });
 
   grunt.registerTask('auto-build', [
-    'build:all',
+    'browserify:watch',
     'connect:livereload',
     'watch'
   ]);

package.json

@@ -45,6 +45,7 @@
     "grunt-jasmine-node": "~0.2.1",
     "grunt-release": "~0.7.0",
     "load-grunt-tasks": "~0.3.0",
+    "time-grunt": "~0.3.0",
     "karma": "~0.12.8",
     "karma-jasmine": "https://github.com/Nikku/karma-jasmine/archive/jasmine-v2.0.0-latest-1.tar.gz",
     "karma-chrome-launcher": "~0.1.2",
@@ -59,8 +60,8 @@
     "lodash": "~2.4.0",
     "didi": "~0.0.4",
     "jquery": "~2.1.0",
-    "through": "^2.3.4",
-    "jquery-mousewheel": "^3.1.11"
+    "jquery-mousewheel": "~3.1.11",
+    "through": "~2.3.4"
   },
   "dependencies": {
     "bpmn-moddle": "~0.0.1",