Handle with other operators besides =

We can use raw SQL but would be nice something less handful

`SELECT * FROM users WHERE id != "bla"`

Something like that:

`Foo.find({ name: { type: NOT, value: "James" } })`

@fakenickels idea:
`Foo.find({ name: Not("James") })`
`Not(Between (2))`

A class from Operator, so we can switch on top
So we can have Not, Equal, Between
And in the query builder we detect and add the correspondent query

More ideas?