Update biweight_location and biweight_midvariance for handling
small sample sizes.  Added tests for this as well.
Fixing console progressbar without multiprocessing return value
Close multiprocess pool spawned by the progressbar

- Calls p.close() and p.join() to prevent the multiprocess pool from spinning out of control.
Merge pull request #1085 from astronomeralex/bootstrap

Added bootstrap function to stats
Merge pull request #1381 from alexrudy/multiprocess-progressbar

Close Multiprocess progressbar Pool
Merge pull request #1378 from crawfordsm/biweight_bug with manual conflict resolution

Conflicts:
	astropy/stats/tests/test_funcs.py