Optimus

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* Moved package configuration to everything in ``setup.cfg``;
* Updated Makefile;
* Removed ``docutils`` requirement and commented code for unused modules for rst
support until it has been updated;
* Added some tests to cover template inclusion;
* Updated to ``watchdog`` to ``==0.9.0``;
* Added settings copy into context item ``_SETTINGS``, close 26.

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* Fixed documentation;
* Fixed project templates Makefile;

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Rewriting everything to be Python >=2.7 and Python3 compatible with unittests coverage
using pytest and tox.

* Drop 'argh' in favor of 'click' for commandline scripts, this involve commandline has
a minor changes on command options usage, close 23;
* Big cleaning for sanity and update for Python3 support, close 22;
* Support of rcssmin filter for assets;
* ReStructuredText view has been dropped;
* Your old projects should still be compatible minus some specific settings details;

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* Relaxed ``webassets`` version requirement since the last one (0.12.1) has been
validated;
* Removed ``yuicompressor`` requirement. ``ClosureJS`` is recommended for Javascript
compression since YUI is not maintained anymore. But finally Optimus do not require
anymore any compressor library. It's up to the user choice;
* Removed ``EXTRA_BUNDLES`` occurrences since it was deprecated long time ago;
* Updated documentation;

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* Validated working with ``CherryPy==8.7.0``, so remove every occurences about 3.x.x
version;
* Better README/Doc index/Package short description;

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* Include ``html5writer.py`` taken from ``rstview`` and so remove dependency to ``rstview``, close 19;
* Move changelog to its own file, updated documentation Makefile, added dev requirements;
* Use ``sphinx_rtd_theme`` in documentation if available;
* Improved watcher logging output a little bit so it reveals changed file when detected without to use the debug level;
* Do not enable anymore ``runserver`` command to installed CherryPy, instead raise a better error message explanation;