Fix #1409

Find pending migrations and return them in getUndoneMigrations
Added test for actual execution
Support for specifying indexes on a model
Cleaning up indexes code a bit
Made addIndexQuery more DRY
Fix an issue with dialect.supports for abstract dialect being overwritten
Merge pull request #2056 from komola/fix/1409

Fix #1409
[ci skip] Merge woops in changelog
Merge master
Merge pull request #2057 from sequelize/indexes

Support for specifying indexes on a model
Merge remote-tracking branch 'upstream/master'