Travis: add Blackberry. Improve Blackberry out-of-box compile.
Add a headless switch to b.sh.
Quieter cmake.
Stop it spamming ' -- Installing' messages. We know it is installing assets.
Also make travis a bit quieter.
Merge pull request #4663 from xsacha/master

Travis: add Blackberry. Improve Blackberry out-of-box compile.