Ctypes-ejdb

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* Fix crash when querying with invalid parameter names. This now raises an
``CommandError``.
* Fix memory leak when calling ``Collection.count``.
* Add API to query for a list of collection names in a database without needing
to construct the collections themselves.
* Add API to check whether a database is writable.
* Add flag to disable coloring in CLI, and disable it on Windows by default.
* ``ejdb.cli`` now has a ``--version`` option.

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* Fix Python 2 compatibility regarding `ejdb.cfg` usage.
* Fix segmentation fault when trying to reuse collection instances retrieved
from iterating through a database.
* ``ejdb.cli`` now creates a non-existent database if the path given does not
exist.
* Add a more meaningful error message when the EJDB binary path is not
configured properly.
* Fix documentation on `Collection.delete_one()` and
`Collection.delete_many()`.

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* Fix ``Collection.delete_one`` and ``Collection.delete_many``.

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* Fix query flag passing.

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* Move ``exit()`` fix in CLI.

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* Fix ``exit()`` call in CLI.