Bug 855501 - Look in other app tree for BUILD_APP_NAME, support app names longer than 15 chars.
Merge pull request #8874 from dhylands/dhylands-855501-Makefile-app-master

Bug 855501 - Look in other app trees for BUILD_APP_NAME, support app names longer than 15 chars. r=fabrice
Bug 855782 - Fix setting caching r=lightsofapollo