Fix regression introduced by PR #510. Fixes #555.
Removed b2g-content.css
Merge branch 'fix-510' of git://github.com/ochameau/r2d2b2g into ochameau-fix-510
correct paths to which Gaia XPIs must be written
Merge pull request #559 from bkase/fix-redundant-sheet

Removed redundant b2g-content.css