test for the createAssoc single sql problem
removing the test for one generated sql statement at @mickhansen's request
Revert "removing the test for one generated sql statement at @mickhansen's request"

This reverts commit 4177188f9dd46e416a2f1d283cd5e8299a7dcd2f.
Merge branch 'bugfix/createAssoc-single-sql' of https://github.com/SohumB/sequelize into SohumB-bugfix/createAssoc-single-sql
1:M createAssociation should only use one query and fix transactions for createAssociation