Bug 924114 - Migrate homescreen tests to use app objects
Merge pull request #13325 from bobsilverberg/v1.2homescreen

Bug 924114 - Migrate homescreen tests to use app objects
Bug 916749 - Bump gaiatest version to 0.14. r=zcampbell
Bug 920473 - Bump gaiatest version to 0.15. r=bebe
Bug 922077 - Bump gaiatest version to 0.16. r=bebe
Bug 926403 - Bump gaiatest version to 0.17. r=dhunt
Bug 927391 - Bump gaiatest version to 0.18. r=dhunt