possible fix for manyToMany relationships using indexes
possible fix for #2416 by dropping indexes from the creation of many-to-many relation tables
unit test against #2416
Merge branch 'master' of https://github.com/sequelize/sequelize
Merge pull request #2422 from nullivex/master

Fixes #2416 - Creation of Many-to-Many associations using indexes
Merge branch 'master' into feature/ms-sql-server