Dont validate fields that are not saved. Closes #1449
Merge branch 'master' of github.com:janmeier/sequelize
Merge pull request #1611 from seegno/fix-hstore-number-cast

Fix hstore parse number conversion
Merge branch 'master' of github.com:janmeier/sequelize
Merged and modified PR #1610. Added test for using promises in validations, thanks to @callumacrae
Add filtering support to increment/decrement
Merge branch 'add-increment-where'
Merge branch 'add-nullable-message'
Merge branch 'support-postgres-json-type'