Failing test for multiple annotation.
Support multiple aggregation.
Merge pull request #101 from ternus/master

Support multiple annotation using different aggregates
Fixing failing playhouse tests due to change in #99
Fixing the benchmark
Notes in the readme
Check for instance on reverse relation access
Support programmatic creation of multi-column indexes
Adding a get_pk_dict method to conveniently retrieve a models id and its
value
Adding a convenience method for getting the pk name so as not to expose
internals
Moving the 'normalization' of field_names into a lower-level method
Allow extra indexes to be specified, including multi-column &
unique
Testing the unique indexes
Adding an Avg aggregate
Adding a case-insensitive equality lookup, 'ieq'
Updating models docs
Adding an is_clsoed method to the db to check conn state
Fixing a testcase
Adding notes on add/drop/rename sql
Version 1.0