Merge pull request #8 from wtsi-npg/devel

Merge devel to master for release 0.02
Merge pull request #13 from wtsi-npg/devel

fix naming convention for bed files in tophat2 vtf
Merge pull request #20 from wtsi-npg/devel

pull request from wtsi devel to master - release 0.05
Merge pull request #21 from wtsi-npg/master

pull request from wtsi master to devel - release 0.05