Suppress warning when /etc/make.conf doesn't exist in FreeBSD
Improve pkgng detection from /etc/make.conf in FreeBSD
Use bash syntax for file detection - update #1984
Merge pull request #1984 from carpodaster/minor-freebsd-pkng-detection-improvements

Minor FreeBSD pkgng detection improvements
fix detecting clang for OSX 10.9, fix #1975
Merge branch 'master' of github.com:wayneeseguin/rvm