Processing times Part 2

Part 2 of PR #69 
1.  Attribute names now have no spaces or dashes [issue 244](https://github.com/18F/foia-hub/issues/244)
2. Relevant tests added

I don't think you need to use regular expression module here. It probably makes more sense to just use replace() https://docs.python.org/3.3/library/stdtypes.html#str.replace