Add group API
Merge pull request #934 from kennknowles/group-api

Add group API
make the xmlns submitted by submit_case_blocks configurable
Merge pull request #935 from dimagi/cz

make the xmlns submitted by submit_case_blocks configurable
move xmlns definition to const file
add location and form checking to commtrack sms tests
handle setting location by trapping the cases_received signal
remove added test that was already failing.
newline
Merge pull request #936 from dimagi/commtrack-reqs

better tests and refactoring how locations get added to forms
Merge branch 'master' into case-columns