Add some server tests and fix some bugs

Summary:
clean up cors

Merge branch 'master' into tests

make clean only removes files in the kronos directory

update settings template

override settings.py properly

remove yaml

override settings before app loads them

Merge branch 'master' into tests

remove cjson

Reviewers: usmanm, marcua

Reviewed By: usmanm

Differential Revision: http://phabricator.locu.com/D2693