Meuhdb

* Lazy indexes option: will write faster, but load slower,
* Changed the way indexes are built/loaded/stored, This might break your data.
But who cares? I'm probably the only one to use this,
* Automatically change index type if inserted value is non-string.

* Small refactor, splitting core module in submodules,
* Bugfix: throw a ``BadValueError`` when the value provided is not a dict,
* Add a new parameter: ``autocommit_after``. DB will be committed after "n"
committable operations (set, insert, update, delete...),
* Bugfix: use deepcopy() for the inserted / updated value. Prevent unwanted
value modification side-effects.

* Hotfixing the tox tests mess.

* Added performances tests, and reordering libs priority,
* Bugfix: prevent list/set mess during index update,
* Added coveralls.io configuration and badge on the README,
* Little refactors for easier access to API, easier versionning, etc.

Added support to:

* ``jsonlib`` (or ``jsonlib-python3``),
* ``yajl`` (couldn't test "yajl" on Python3.4, it failed in Travis tests, but
it worked on my laptop, so, there's no guarantee),

* Added a ``remove_index`` to remove unwanted index,
* Added an ``update`` method,
* Added an ``insert`` method,
* Dropped msgpack format: it was a bad idea,
* The tox test grid is now complete,