Merge pull request #91 from cboursnell/master

merge cbournsell branch
update osx dependency on snap to 1.0dev.50 build
add dryrun dir to gitignore
print eXpress output if it crashes
use threads option in samtools, default to 4
v1.0.0.alpha.1
bump bindeps dependency
Merge pull request #92 from cboursnell/master

Small fixes
include expression in read metrics
bump bindeps dependency to get better error reporting
Merge branch 'master' of github.com:Blahah/transrate

Conflicts:
	lib/transrate/contig.rb
version 1.0.0.alpha2
fix samtools sort threads argument (#96)
update help message
Merge branch 'master' of github.com:Blahah/transrate
Merge branch 'master' of github.com:cboursnell/transrate into cboursnell-master

Conflicts:
	deps/deps.yaml
	lib/transrate/read_metrics.rb
Merge branch 'cboursnell-master'
update coverage calculation, fix tests
round coverage to 2dp
typo in help msg