add option to specify bam-readcount version and also set its default to 0.7
adding bam-readcount version parameter
changing the way bam-readcount version is passed
passing param correctly, removing default version
fix way version is passed around.
passing potentially undefined values around because perl
Merge pull request #335 from ernfrid/add_version_to_process_build_tools

add option to specify bam-readcount version and also set its default to ...
Merge pull request #336 from chrisamiller/master

adding bam-readcount version parameter