Pygments-cache

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**Added:**

* ``add_custom_style()`` to be able to transparently use user defined styles (for xonsh/xonsh3837)

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**Added:**

* Added ``get_all_styles()`` function for fast loading of style names.

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**Fixed:**

* Fixed missing variable name issues in ``get_style_by_name()`` and
``get_filter_by_name()``.

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**Added:**

* Started ``pygments_cache`` project with caching support for the
following pygments functions:

* ``get_lexer_for_filename()``
* ``guess_lexer_for_filename()``
* ``get_formatter_for_filename()``
* ``get_formatter_by_name()``
* ``get_style_by_name()``
* ``get_filter_by_name()``