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

src/html/HtmlReporter.js

@@ -16,7 +16,7 @@ jasmine.HtmlReporter = function(options) {
     htmlReporterMain = createDom("div", {className: "html-reporter"},
       createDom("div", {className: "banner"},
         createDom("span", {className: "title"}, "Jasmine"),
-        createDom("span", {className: "version"}, env.versionString())
+        createDom("span", {className: "version"}, jasmine.version)
       ),
       createDom("ul", {className: "symbol-summary"}),
       createDom("div", {className: "alert"}),