Updating js client to 0.1.15
Merge pull request #740 from vladikoff/jsclient15

Updating js client to 0.1.15
fix(l10n): fix configuration typo causing default language to be undefined
Merge pull request #745 from mozilla/issue-741-en-locale

fix(l10n): fix configuration typo causing default language to be undefin...
chore(build): add interactive=false flag to bower install
fix(client): Hide sign out from users who signed in from Firefox desktop.
Merge pull request #750 from pdehaan/issue-744-bower-usage-stats

chore(build): add interactive=false flag to bower install
Merge pull request #731 from mozilla/issue-612-session-refactor

fix(client): Hide sign out from users who signed in from Firefox desktop.
Release v0.0.6
Fixes #754
Merge pull request #755 from vladikoff/hotfix-require

Fixes #754