pep8 in tutorial
Add tutorial example in the tests.
Fix opt bug not release that make in the end a stability opt not applied.

reported by David Huggins Daines
Merge pull request #1699 from nouiz/test_example

Fix stabilization opt not being applied(in dev version only)
Make sure local_greedy_distributor won't be skipped again.
Add comment.
In tests, use comparison that give more error message when it fail.
Make ScipyGer opt faster by not creating new object each time.
Fix ScipyGer compute_map unhandled error.
Make test error more informative.
Add gpu blas timming.
Test NumPy blas flag before reusing them. Sometimes the dev package
isn't installed, so we can't reuse them.
Merge pull request #1701 from nouiz/local_greedy_distributor

Local greedy distributor, make sure it won't be skipped again.
Merge pull request #1704 from nouiz/scipy_ger

Fix ScipyGer crash
Fix tests errors (float32, useless error from DebugMode(the inf is removed by an opt, faster tests)
Print more detailled warning.
Merge pull request #1705 from nouiz/fix_tests

Fix tests errors in buildbot
Better warning message.
Merge pull request #1706 from nouiz/warn_msg

Better warning message.
fix crash in the new warning message.