partial refactor, continued

moved models into their own files; added methods. getting a weird
"global name Category not defined" error. have to switch back to the
trunk for a few days but will get back to this asap.
finished moving functions to Model classes
edited URIs
Import routine supports test suite evolution

This commit also includes more refactoring and some URI changes.
UI updates related to testsuite migration

Alerts the user that an evaluation requires review; new or changed
tests marked accordingly in the edit evaluation form.
Added export feature

Fixes issue #3
Added some notes
Refactor continued; started filter view
Added branding, feature-first view
Merge pull request #9 from marisademeglio/refactor

Refactor