Performance improvements on includes

Work in progress, just getting travis to cover my ass while i refactor.
Running test on https://gist.github.com/mickhansen/9770919 - Code looks like shit cause its from CS (perf test was provided, i just added a bit to it).
The query produces 12000 rows that sequelize has to digest down to 2000 model instances with nested objects.

Using the v8 profiler via node --prof and analyzing with https://github.com/sidorares/node-tick

Timings (ms):
2898~
2564~ (primaryKeyMap refactor)
2464~ (got rid of _.omit in favor of delete)
2330~ (don't set previous value in loop if raw)
2100~ (upgrade to dottie 0.2.1 which has .transform performance improvements)
2000~ (don't attempt to check for or convert dates if raw, date conversion from the db is currently handled in the drivers)