Fix frequent segfaults while using the gpu on Mac.
Remove the test file for nvcc_compiler since the only tested function was the one that was removed.
Merge pull request #1692 from abergeron/mac_link

Fix frequent segfaults while using the gpu on Mac.
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)
Minor typo fixes in doc
Typo fixes in doc
Minor typo fix in docstring