extra filter methods, ensure delegated everywhere
associated_ids_for class method
attributes_matching index method
gem updates
relax travis ruby versions, remove temporary rubygems fix for 1.8.7
misc fixes
mv record @is_new so that callbacks can add associated records
WIP docs
WIP docs -- simple attrs
gem updates
WIP docs -- complex attrs
WIP docs -- validations
WIP docs -- callbacks
WIP docs - associations
glob find_by_ids args
Merge branch 'master' into data_backends

associated_ids_for not yet implemented across backends