Adding get_term_by_date to sws's term.

Making it so applications can get a term for an arbitrary date, rather depending on the current term.
Merge pull request #22 from uw-it-aca/feature/term_by_date

Adding get_term_by_date to sws's term.
Resolve conflict with merge - remove restclients/sws/v4/registration.py; add is_auditor attribute.
using simplejson to parse strings as decimal rather than floats
Adding test to cover float parsing
Adding float>Decimal parsing to restclient view
fixing test name
Merge pull request #26 from uw-it-aca/bugfix/MUWM-2033

using simplejson to parse strings as decimal rather than floats
Merge branch 'develop' into qa