Ensure htslib and libmaus dependencies are pre-installed and linked. chapmanb/bcbio-nextgen#356
Skip build of vcftools for bcbio pipeline due to issues with default libz on ubuntu 12.04. Fixes chapmanb/bcbio-nextgen#353
Alternative approach to avoiding color output that will work with Mac ls. Fixes gemini bug: https://groups.google.com/forum/?fromgroups=#!topic/gemini-variation/aT0KmO1FM1s