Added ENUM type
Fixed a typo in PG Query Generator ENUM update
Added DataTypes require to PG and SQLite Query Generator
Fixed a typo in PG Query Generator
Added a few tests, DRY'd out some PG ENUM code
Merge branch 'master' of git://github.com/domesticapps/sequelize into domesticapps-master
tests for enums
added failing test for values out of enum range