Cherry pick change to url matching regular expression. Fixes LMS-37
Fix a few remaining tz naive dates

And remove redundant but != date parsing methods. In process make
the general parsing function less lenient (don't default date nor
month)
Fix a few remaining tz naive dates

And remove redundant but != date parsing methods. In process make
the general parsing function less lenient (don't default date nor
month)
timezone conversion tests
timezone conversion: more unit tests

and code reorganization
need to import os
remove assets.js from the PIPELINE_JS since it seems to cause that file to be loaded twice
actually, seems like if we remove it from PIPELINE_JS then it doesn't work in production
Make the variable and method names clearer
Update fields.py

When changing variable names for code review critique, accidental cut/paste prevented intended behavior.
Fixed the preferences scope of xblock.

Added self to authors.