Bug 834924 - Release addon builder helper 1.5
Update version to 1.6-dev.
Fix broken test. utils/data.getChromeURIContent has been deprecated but its replacement doesn't work correctly.
Merge pull request #6 from ochameau/repack-sdk1.13-release-abh1.5

Bug 834924 - Release addon builder helper 1.5 r=erikvold