Add case status filter

Still needs to be added to reports loaded from snapshots
add filter to beneficiary report
Merge remote-tracking branch 'origin/master' into opm_filter
fix opm fluff
Merge pull request #2159 from dimagi/opm-fluff-fix

fix opm fluff
use .form instead of .get_form throughout
Don't load snapshot when filtering by case status.
Switch to use the existing open/closed filter
Move case status filter to the bottom
change shortcut to command space
Merge pull request #2161 from dimagi/form

use .form instead of .get_form throughout
Merge pull request #2164 from dimagi/ks

change shortcut to command space
If user doesn't have name, default to username
Merge pull request #2166 from dimagi/call-center-bug

If user doesn't have name, default to username
Merge pull request #2147 from dimagi/opm_filter

Add a case status filter to OPM BPR
use json_response for json_response (allowing date keys)

http://manage.dimagi.com/default.asp?90087
Merge pull request #2167 from dimagi/cz

use json_response for json_response (allowing date keys)
remove unused import
make all fixturegenerators require explicit args

args are always passed in, so having a default value of V1 for version
is misleading/confusing.
Merge pull request #2169 from dimagi/drob/cleanup

Drob/cleanup