added a StringField to be used in IndicatorDocuments to perform simple operations such as extracting values from a case
added flat field that provides a callable that accepts a case and returns a string
fix overwriting key
Merge pull request #48 from dimagi/asdf

fix overwriting key
updated README.md to correct an error in the example code
Merge pull request #50 from esoergel/update_group_by_documentation

updated README.md to correct an error in the example code
update readme to include yield dict with group_by example
In fluff calculator, if group_by is a tuple, coerce to a list
Merge pull request #52 from dimagi/coerce_group_by

In fluff calculator, if group_by is a tuple, coerce to a list
Merge branch 'master' into flatfield
Prepended doc_type to the key in map.js
Merge branch 'prepend_doc_type_to_key' of https://github.com/dimagi/fluff into flatfield
Fix fluff getter_function for properties
Merge pull request #53 from dimagi/prepend_doc_type_to_key

Prepended doc_type to the key in map.js
Merge pull request #54 from dimagi/getter-fix

Fix fluff getter_function for properties
Allows you to pass a date range to get_result and not specify a window in the calculator
Merge branch 'allow_date_range' of https://github.com/dimagi/fluff into flatfield
added Danny's suggestions
Merge pull request #55 from dimagi/allow_date_range

Allows you to pass a date range to get_result
Revert "process doc changes using gevent"

This reverts commit 644b981c974c4b33c7203ef5a5b3a854eae4c95b.