Updates mongodb driver.remove() to use convertToDB
Adds mongodb support for ORM query comparators

The only one that I'm not sure is ok is LIKE => $regex
Fixes previous commit to avoid checking for sql_comparator on undefined
Fixes more test to work as primary key agnostic
Fixes validation test for mongodb
Excludes 2 more tests from mongodb testing (property number size and lazyload)
Removes code to stop some tests on mongodb

They will be blacklisted in run.js
Adds proper support for mongodb in test framework