Added is_sequence and is_pair for checking if input is from paired end
sequencing or not.
Merge branch 'master' of https://github.com/chapmanb/bcbb
Added split_vcf plus a unit test.
Merge branch 'master' of https://github.com/chapmanb/bcbb
Added Tophat 2 support.
Switched from throwing exceptions to exiting since there is nothing to handle.
Merge pull request #64 from roryk/master

Tophat2 support, vcf splitter by chromosome, some utilities.