add c ext build artefacts to gitignore
changed samtools download to an archive that contains the binaries
fixed link to samtools to be to raw file
fixed reference coverage calculation; bumped crb-blast version in gemspec
fixed error caused by variable not being set
fixed contig low uniqueness bases to be a float
Merge branch 'master' of github.com:Blahah/transrate
Merge branch 'master' of github.com:cboursnell/transrate into cboursnell-master

Conflicts:
	transrate.gemspec
git push origin masterMerge branch 'cboursnell-master'