Hunter

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* Implemented a destructor (``__dealloc__``) for the Cython tracer.
* Improved the restoring of the previous tracer in the Cython tracer (use ``PyEval_SetTrace``) directly.
* Removed ``tracer`` as an allowed filtering argument in ``hunter.Query``.
* Add basic validation (must be callable) for positional arguments and actions passed into ``hunter.Q``. Closes
`23 <https://github.com/ionelmc/python-hunter/issues/23>`_.
* Fixed ``stdlib`` checks (wasn't very reliable). Closes `24 <https://github.com/ionelmc/python-hunter/issues/24>`_.

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* Fixed missing import in ``setup.py``.

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* Fix a compile issue with the MSVC compiler (seems it don't like the inline option on the ``fast_When_call``).

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* Implemented fast tracer and query objects in Cython. **MAY BE BACKWARDS INCOMPATIBLE**

To force using the old pure-python implementation set the ``PUREPYTHONHUNTER`` environment variable to non-empty value.
* Added filtering operators: ``contains``, ``startswith``, ``endswith`` and ``in``. Examples:

* ``Q(module_startswith='foo'`` will match events from ``foo``, ``foo.bar`` and ``foobar``.
* ``Q(module_startswith=['foo', 'bar']`` will match events from ``foo``, ``foo.bar``, ``foobar``, ``bar``, ``bar.foo`` and ``baroo`` .
* ``Q(module_endswith='bar'`` will match events from ``foo.bar`` and ``foobar``.
* ``Q(module_contains='ip'`` will match events from ``lipsum``.
* ``Q(module_in=['foo', 'bar']`` will match events from ``foo`` and ``bar``.
* ``Q(module_regex=r"(re|sre.*)\b") will match events from ``re``, ``re.foobar``, ``srefoobar`` but not from ``repr``.

* Removed the ``merge`` option. Now when you call ``hunter.trace(...)`` multiple times only the last one is active.
**BACKWARDS INCOMPATIBLE**
* Remove the ``previous_tracer`` handling. Now when you call ``hunter.trace(...)`` the previous tracer (whatever was in
``sys.gettrace()``) is disabled and restored when ``hunter.stop()`` is called. **BACKWARDS INCOMPATIBLE**
* Fixed ``CodePrinter`` to show module name if it fails to get any sources.

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* Added a ``clear_env_var`` option on the tracer (disables tracing in subprocess).
* Added ``force_colors`` option on :class:`hunter.actions.VarsPrinter` and :class:`hunter.actions.CodePrinter`.
* Allowed setting the `stream` to a file name (option on :class:`hunter.actions.VarsPrinter` and
:class:`hunter.actions.CodePrinter`).
* Bumped up the filename alignment to 40 cols.
* If not merging then ``self`` is not kept as a previous tracer anymore.
Closes `16 <https://github.com/ionelmc/python-hunter/issues/16>`_.
* Fixed handling in VarsPrinter: properly print eval errors and don't try to show anything if there's an AttributeError.
Closes `18 <https://github.com/ionelmc/python-hunter/issues/18>`_.
* Added a ``stdlib`` boolean flag (for filtering purposes).
Closes `15 <https://github.com/ionelmc/python-hunter/issues/15>`_.
* Fixed broken frames that have "None" for filename or module (so they can still be treated as strings).
* Corrected output files in the ``install_lib`` command so that pip can uninstall the pth file.
This only works when it's installed with pip (sadly, ``setup.py install/develop`` and ``pip install -e`` will still
leave pth garbage on ``pip uninstall hunter``).

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* Fixed :attr:`hunter.event.Event.globals` to actually be the dict of global vars (it was just the locals).