Add version command to mym

 * mym('version') displays version string
 * v = mym('version') returns struct with fields 'major', 'minor', 'bugfix'

Version 2.6.8 binary release

Version 2.6.5 Release Candidate 2 binary release

Merge pull request datajoint#4 from datajoint/cleanup

Clean up of mym

Version 2.6.5 Release Candidate binary release

Remove superfluous zlib source code for Mac

Mac comes with zlib 1.2.3 or later starting with Mac OS X 10.4.
There is no reason to bundle our own.