Start implementing version_hash
Merge remote-tracking branch 'origin/support_jruby_1.6.7.2' into version_hash
Move hash calculation code into Runtime
Implement hashing and add tests.
Minor reformatting
Add a test for database_definition.version_hash
Remove debug prints
Slight improvement to hash file collection test
Merge pull request #12 from jcosmo/version_hash

Version hash