Merge pull request #42 from rmsmith/master

update test/harness_browser.html to use all the latest *.js scripts
work on the `chrome.app.window` API + some basic window tests
restoring `ChromeApp` and `ChromeWindow` as public types with private ctors
dartdoc the AppWindow

more or less a copy / paste from the javascript API docs with small
style fix (dart style guide uses 'this' instead of 'the' on instance
method docs)
put the dartdoc back on the `current` getter
more dartdoc
more dartdoc
Merge pull request #44 from rmsmith/app_window

work on the `chrome.app.window` API + some basic window tests
Merge branch 'master' of https://github.com/rmsmith/chrome.dart