Merge pull request #1 from wtsi-npg/devel

Devel
Create bai and md5 files, and save bed files
Add prefix to bed files
Change '.bed' filenames from optional with defaults to hard-coded
Merge pull request #5 from jenniferliddle/devel

Create bai and md5 files, and save bed files
Merge remote-tracking branch 'wtsi/devel' into devel