public / sequelize

make UniqueConstraintError inherit ValidationError

Unique constraint errors are in fact a different type of validation
error, run on the database level. While important to make a destinction
internally when we have encountered a UniqueConstraintError vs a normal
ValidationError, on the user side they should be represented the same.
This patch allows these exceptions to provide data in the same fashion
making it easier to uniformly process the errors

…changes attributes alone), closes #2341

… options, closes #2012

…by default since they are querying on primary key, closes #2698

…ation.scope, closes #2740

clean and lint tests, enable jshint on tests

Ran fixjsstlye on all the tests, fixed any outstanding errors, and
enabled jshint for checking tests in continuous integration.

Mark migration logic as deprecated.

add `.original` property to custom Error classes

The current `.parent` property is a bit of a misnomer. `.original`
better conveys the intent of the field and function of the class, which
is to wrap the original database error.

This commit does not remove the current `.parent` property for backwards
compatibility.

This commit deprecates the migration logic from the
sequelize core references the rewritten CLI and the
new migration engine. Also this commit removes the
respective migration tests.

Resolving multiple hasMany cascades which weren't working in some cases

… are not made for hooks:true #2746

…aints are not supported. #2736