Fixed a bug with empty or filters
Revert "Revert "Refactor ExpandedMobileWorkerFilter, adding WebUser data to Case List report""

This reverts commit e227147a4b1ad0799fafb50b1a48118008f79a54.
Merge remote-tracking branch 'origin/group-filter-fix' into emwf-refactor
Selective sync for user groups
Only make one db call for groups
Refactor sessions_by_touchforms_id view
Improve performance of XFormsSession lookups
Remove custom location properties

But not the scaffolding because this will come back soon and we might
want some of it....
Make ivr report sort by timestamp descending by default
initial structure and organization of HQ's Style Guide as an app of corehq
add models.py file
Merge pull request #4144 from dimagi/ivr-report-performance

Improve Call Log Report performance
Merge pull request #4153 from dimagi/style-guide

initial structure and organization of HQ's Style Guide as a corehq app
Merge pull request #4152 from dimagi/opm

OPM Custom Report Changes
don't crash if a fixture item has keys that were removed from the type

http://manage.dimagi.com/default.asp?131030
make location download loginwalled.
Merge pull request #4155 from dimagi/location-download-security

make location download loginwalled.
tweak premature auto gps
Merge pull request #4156 from dimagi/tweak-premature-auto-gps

tweak premature auto gps
add simple profiling walkthrough