v2.2.0

• Added hunter.predicates.From predicate for tracing from a specific point. It stop after returning back to the same call depth with a configurable offset.
• Fixed PYTHONHUNTERCONFIG not working in some situations (config values were resolved at the wrong time).
• Made tests in CI test the wheel that will eventually be published to PyPI (tox-wheel).
• Made event.stdlib more reliable: pkg_resources is considered part of stdlib and few more paths will be considered as stdlib.
• Dumbed down the get_peercred check that is done when attaching with hunter-trace CLI (via hunter.remote.install()). It will be slightly insecure but will work on OSX.
• Added OSX in the Travis test grid.