BUG: Build random forests the same way regardless of n_jobs and add a test for this. Don't predict in parallel since the cost of copying memory in joblib outweighs the speedups for random forests. Fixes #1685.
COSMIT: Fix up a loop.
COSMIT: Better assert.
DOC: Update new magic numbers in docs since random forests train differently now.
FIX: sklearn.ensemble.forest: Refactor to remove references to parallelism in predict() functions.