Move web-platform-test harness into its own subdirectory.
Don't assume we are in a mozilla tree to get prefs
Don't use autoproxy for B2G, change the hosts file instead.
Add tests for conditional backend, and fix some bugs tests found
Rename mozmanifest -> wptmanifest and start adding some tests for update.
Add a .gitignore file
fixup
Add option to not do a commit on update.
Remove some Mozilla-specific scripts
Refactor code for better os/browser support.

* Get runner working on Windows.
* Add pluggable support for multiple browser products
* Add experimental Chrome support based on WebDriver
Start adding some documentation for various classes.
Log non-result output from Servo.
Fix some lint errors.
Start adding documentation.
fixup! Start adding documentation.
Add some basic usage docs.
fixup! Add some basic usage docs.
More documentation updates.
Add support for --b2g-no-backup option.
Bump version to 0.3-rc1