mod.  move MySQL query dependence out of time_to_threshold
mod.  move MySQL query dependence out of blocks. PEP-8 compliance.
mod.  move MySQL query dependence out of edit_count/
Add. decorator to handle filtering and normalizing user cohorts
mod.  move MySQL query dependence out of namespace_edits. PEP8.
add. doc strings to query methods
add. pre process decorator to namespace edits.
mod.  rename query_method decorator.  add. post query processing.
Adds install_requires with known dependencies.
Merge pull request #45 from dsc/master

Looks good. Merged.
Merge branch 'master' into frontend
fix. namespace_edits for query_calls
fix. conn init in blocks_user_map_query & blocks_user_query
mod. move connection setup and tear-down into query_calls for revert_rate.
add. DB_MAP to data_loader module.  mapping between project and db instance.  Replaced some instance refs in query_calls module
add. query method decorator to blocks method.  Modified attribute that resolves to key of query hash since __name__ is overwritten by wrapper method.
mod. add decorator to edit count query method
add. query method wrapper to time to threshold in query calls
mod. use query method wrapper on revert_rate
add. method to generate query call for user registration date: user_registration_date