Move to grunt for building all distribution files.

* canonical version number of jasmine-core is now is package.json
* `grunt buildDistribution` builds jasmine.js, jasmine-html.js, jasmine.css and outputs them to the dist dir
* `grunt buildStandaloneDist` builds the example spec runner files and compresses them to dist/jasmine-VERSION.zip
* `grunt compass` compiles jasmine.css
* jasmine.Env handling of version is backwards compatible, but uses the version string directly (and nicely deprecated)
* Ruby/thor tasks that did the above deleted

Gruntfile.js

@@ -1,24 +1,25 @@
 module.exports = function(grunt) {
+  var pkg = require("./package.json");
+  global.jasmineVersion = pkg.version;
 
-  // Project configuration.
   grunt.initConfig({
-    pkg: grunt.file.readJSON('package.json'),
-    jshint: {
-      options: {
-        /* While it's possible that we could be considering unwanted prototype methods, mostly
-         * we're doing this because the objects are being used as maps.
-         */
-        forin: false,
-
-        /* We're fine with functions defined inside loops (setTimeout functions, etc) */
-        loopfunc: true
-      },
-      all: ['src/**/*.js']
-    }
+    pkg: pkg,
+    jshint: require('./grunt/config/jshint.js'),
+    concat: require('./grunt/config/concat.js'),
+    compass: require('./grunt/config/compass.js'),
+    compress: require('./grunt/config/compress.js')
   });
 
   grunt.loadNpmTasks('grunt-contrib-jshint');
+  grunt.loadNpmTasks('grunt-contrib-concat');
+  grunt.loadNpmTasks('grunt-contrib-compass');
+  grunt.loadNpmTasks('grunt-contrib-compress');
 
-  // Default task(s).
-  grunt.registerTask('default', ['jshint']);
+  var standaloneBuilder = require("./grunt/tasks/build_standalone.js")(grunt);
+  standaloneBuilder.registerTasks();
+  
+  grunt.registerTask('default', ['jshint:all']);
+  grunt.registerTask('buildDistribution',
+    'Builds and lints jasmine.js, jasmine-html.js, jasmine.css',
+    ['compass', 'jshint:beforeConcat', 'concat', 'jshint:afterConcat']);
 };