add support for a --full command-line option

Add support for a --full command-line option. This indicates that a full build is requested.
WebComponent: implement Node.nodeValue

Closes https://github.com/dart-lang/web-ui/issues/320
Use correct Path ctor

Closes https://github.com/dart-lang/web-ui/issues/322
Merge pull request #321 from kevmoo/master

Fixes for libv2 changes
Fixes to have a clean package after the latest breaking changes from bleeding
edge.

BUG=

Review URL: https://chromiumcodereview.appspot.com//12052035
Update .gitignore
Merge pull request #315 from devoncarew/master

Modify lib/component_build.dart to add support for a --full command-line arg
eliminate confusing local variable 'json' with imported library
Merge pull request #324 from kevmoo/master

Fixed crash in error handling flow
Publish bug fix
Fixes in web_ui for the next sdk

Review URL: https://chromiumcodereview.appspot.com//12093025
Fixes from code review

Review URL: https://chromiumcodereview.appspot.com//12084039
Style attributes and printing messages:
* Move the map support from data-style to style.
* Make messages print again (I noticed that we were again not printing things
  now that I added a new warning).

Review URL: https://chromiumcodereview.appspot.com//11717002
Support for constant attributes passed to web components

Review URL: https://chromiumcodereview.appspot.com//11708002
Switch to use browser/dart.js (fix #300)

Review URL: https://chromiumcodereview.appspot.com//12079051
Update CHANGELOG.md
Push a new version with the latest features (includes printing warnings again)

Review URL: https://chromiumcodereview.appspot.com//12084070
fix for breaking html5lib change

Review URL: https://chromiumcodereview.appspot.com//12087111
fix #304 - better warnings for missing script type

Review URL: https://chromiumcodereview.appspot.com//11878012
Fixing bug in the evaluation order of watchers

Review URL: https://chromiumcodereview.appspot.com//12162005