fixed Utils.addTicks

In previous version, Utils.addTicks method wraps parameter string around Utils.TICK_CHAR whether parameter string has dot (has table name) or not.
so now I fixed this problem. would you like to add this to your code?

before:

    Foo.findAll({ group: "`foo`.`baz`"}) // => SELECT * FROM `foo` GROUP BY `foo.baz`

after (i fixed):

    Foo.findAll({ group: "`foo`.`baz`"}) // => SELECT * FROM `foo` GROUP BY `foo`.`baz`


_edit by janmeier - code formatting_