Remove limit on ids passed to case ES query
move id_strings to their own file
add is_custom_app_string function

- register app string patterns
- check against a regex
do not auto fill custom translations

and move get_translations into app_manager
added subtitle and place to signature, removed logo and 'branch name' column in beneficiary payment report
expand and hook up doc test for _format_to_regex
remove print statement
update commcare version on copy

including from exchanage
Add CommTrack to feature previews
Fixed tests and added support for old snapshots
removed 'PNC status' column and refactored 'visit_completion' calculations
upgrade alembic and fluff
Merge pull request #3238 from dimagi/alembic

upgrade alembic and fluff
update fluff submodule
Removed first header-row in exported excel file.
Merge pull request #3239 from lwyszomi/bihar_export_quickfix

Removed first header-row in exported excel file.
update django to 1.5.6
fix tests that involve importing apps
Update CommTrack description in Feature Previews
Merge pull request #3241 from dimagi/django-1.5.6

update django to 1.5.6