Description of problem:
Edition parameter in content spec should be able to contain alpha and numeric information. For example, 
Edition = 7.1.0.Beta1
or
Edition = 7.1.0 Beta1 

This would enable writers to easily/simply/most efficiently produce Alpha/Beta versions of docs. [Other parameters such as version could be changed but this has knock-on effects such as requiring new brew packages to be created.]


Version-Release number of selected component (if applicable):
Build 201309081012


Actual results:
Attempting to use non-numeric gives rise to validation error 


Desired results:
Alpha values should be accepted