Top-level directory should include version, be lowercased

When I unpack the tar.gz distribution, it dumps everything in a directory called Bamboo/. This breaks the widely followed convention of having a top-level directory that a) is lowercase, b) includes the version, eg. bamboo-2.1.1/. Omitting the version means that if I untar into /usr/local, I will clobber and corrupt my existing Bamboo installation. Having random uppercase letters just breaks alphabetic listings.

By all means keep Bamboo for the .dmg distribution, but please follow the conventions of what users expect a tar.gz to contain, like all other Atlassian product tar.gz's do.