Merge branch 'master' of github.com:sequelize/sequelize
Update query-generator.js

Added CREATE INDEX **IF NOT EXISTS**
Update query-generator.js

Added DROP INDEX **IF EXISTS**
Merge pull request #776 from coderbuzz/patch-2

Update query-generator.js
Merge pull request #775 from coderbuzz/patch-1

Update query-generator.js
Merge branch 'master' into newbust
Cleaned up BusterJS even more, hopefully this will fix most of the problems.