Merge pull request #1 from DrMarcII/master

WebDriver API rewrite
Add Keys enum and test that uses TAB.
Changed tab test to use Keys.TAB.
Merge branch 'master' of https://github.com/dart-lang/webdriver into keys
Merge pull request #2 from DrMarcII/keys

Add keys.dart that defines a bunch of static const Key values.
Add support for implicit List<WebElement> for fields defined as List and
without a ListOf annotation.
Various minor fixes:

 - switch to single-line comments were appropriate
 - any methods on various objects that returned raw Future with no
   or poorly defined value now return a Future<this>
 - changed some line breaks etc. to improve readability
Merge pull request #4 from DrMarcII/style

Various minor fixes and updated the version number to 0.7.1 in prep for next release.
Merge branch 'master' into pageloader