astropy/astropy — pull request #959 by adrn (2013-04-09 14:35:15+00:00)
Title: Adds 'time' as a physical type in units

Currently, time-like units have an unknown physical type:

>>> u.s.physical_type
u'unknown'

This just adds a defined 'time' physical type. There was one test that failed after making this change, but I don't understand the purpose of the test so I removed it...