Bug 1022928 - Build symbols for vendor libs.

Include the vendor libraries directory in the buildsymbols path.
Bug 1022728 - Depend on gaia-prefs rather than profile.tar.gz
Merge pull request #192 from walac/bug-1022928

Bug 1022928 - Build symbols for vendor libs.
Merge pull request #193 from michaelwu/bug-1022728

Bug 1022728 - Depend on gaia-prefs rather than profile.tar.gz
Revert "Bug 1022728 - Depend on gaia-prefs rather than profile.tar.gz"
Merge pull request #195 from mozilla-b2g/revert-193-bug-1022728

Revert "Bug 1022728 - Depend on gaia-prefs rather than profile.tar.gz"