Add more exceptions.

I'd really wish that cyanogenmod would update their gerrit so that I
can just check the STATUS key in the json output, instead of having
static exceptions, oh well.

Signed-off-by: Bryan Hundven <bryanhundven@gmail.com>
Make fetch parallel

This breaks fetch functions out of the for-loop

Also, automatically gc.

Signed-off-by: Bryan Hundven <bryanhundven@gmail.com>