Textile

* Remove extraneous arguments from textile method. These were originally added long ago to work with django, but markup languages are long gone from django.
* Bugfix: Don't mangle percent-encoded URLs so much. (45)
* Bugfix: More fixes for poorly-formatted lists. (46)
* Bugfix: Improve handling of whitespace in pre-formatted blocks. This now matches php-textile's handling of pre blocks much more closely. (47)

* Bugfix: Don't die on pre blocks with unicode characters. (43)
* Bugfix: Fix regressions introduced into the code between 2.2.2 and 2.3.11. (Special thanks to adam-iris for providing pull request 44)
* Bugfix: Don't just die when processing poorly-formatted textile lists. (37)
* Add Python 3.6 to testing.
* Add a "print the version string and exit" argument to the cli tool: `pytextile -v`

* Bugfix: Don't strip leading dot from image URIs 42

* Packaging: cleanup in MANIFEST.IN leads to better linux packaging, and smaller wheel size.

* Packaging: remove extraneous files from the source distribution upload.
* Remove a lingering file from a feature branch for overhauling list handling. This brings coverage back up to 100%

* Bugfix: Fix process of string containing only whitespaces (40)
* Bugfix: Fix process of formatted text after lists (37)
* Test: Use sys.executable instead of 'python' to test the CLI (38)