Fix #155 - allows users to omit the top-level script tag if it is basically
empty. This makes it possible to treat any HTML file as an entrypoint.

If a file doesn't have a script tag, we assume it to be:
   <script type='application/dart'>main() {}</script>

We also provide a --components_only flag, that can be used to avoid generating
the entrypoint and bootstrap logic, and generate only the components defined in
a file.

Review URL: https://chromiumcodereview.appspot.com//11699003
update changelog to include notes about 0.2.11 and upcoming changes
Updates to the web_ui package to use lib v2

Review URL: https://chromiumcodereview.appspot.com//11855002
Fix #312 - use the correct import location in the bootstrap code.

Review URL: https://chromiumcodereview.appspot.com//11918002
Add a warning about using a component that isn't referenced.
Warning was only being issued for is="", now it is for x- tags too. Also added tests for new and existing warnings.

Review URL: https://chromiumcodereview.appspot.com//12016007
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