Try to fix LLVM 3.4/5 build

There is a new ppa with LLVM 3.4 backported to Ubuntu precise.
Renamed README to README.md and added build status from Travis.
Merge of DMD FE 2.065.0
Merge branch 'master' into merge-2.064
Merge branch 'master' into merge-2.065
Merge branch 'merge-2.064' into merge-2.065