* Break CSS into modules.
Drops the compile test by 3 KB.
Remove obsolete .blocklyDraggable class stub (it used to be dynamically changed).
Remove unused menuseparator CSS.
* Improved Blockly.XML comments.
* Support JSDOM as an alternate parser under Node.js
* Throw standard errors instead of goog.asserts.
* Adding textToDomDocument_ and override in gulpfile.
The gulp file is derived from work in PR #887, with numerous
refinements and clarifying comments.
Also updating the version number in package.json, including the
'develop' prerelease tag for the develop branch.
* Changing root script for tests under Node.
Was: tests/jsunit/test_runner.js
Now: tests/test_runner.js
The webdriver & jsunit calls formerly in tests/jsunit/test_runner.js
are now in function runJsUnitTestsInBrowser, in
run_jsunit_tests_in_browser.js, called from tests/test_runner.js.
This makes room for additional tests under Node, such as headless and generator tests.
