BLD: test_perf, set cpu affinity and do a gc collect between vbs, in --head mode
BLD: test_perf, add burn-in, warn if 'affinity' missing, transpose running order in --head
BLD: test_perf, explicitly disable gc for runs, correct help message
BLD: numpy 1.7.0 is on pypi, no need to get it from GH anymore
BUG: Series diff(0) fails #3257
BLD: more travis.yml cleanup
BLD: test_perf, do a collect once per --repeats, after each b.run()
DOC: update scipy.py #2916

renamed interpolation -> interpolation_method.
Merge pull request #3262 from chappers/docstring

DOC: update scipy.py #2916
TST: refurbished to_csv ignores file mode GH3263
BUG: refurbished to_csv ignores file mode GH3263
CLN: docstring fixes
micro + nanosecond time support