Ipythonblocks

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* Added ``BlockGrid.animate`` attribute and ``BlockGrid.flash`` method
to facilitate animation of grid changes in the Notebook.
* Added `Pixel` and `ImageGrid` subclasses that behave more like image
manipulation libraries.
* Added cell titles so hover the mouse over a block displays the block
index and color.

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* ``Block.row`` and ``Block.col`` are now set by their containing
``BlockGrid`` at the time the ``Block`` is returned to the user.
This means that while iterating over a subgrid the first ``Block``
will have coordinates (0, 0).
* Getting a single row from a ``BlockGrid`` will return a new ``BlockGrid``
* Raise a TypeError when indexing a ``BlockGrid`` with a length one tuple
* Added a ``Block.colors`` property

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* Convert assigned floating point numbers to integers for HTML compatibility
* Added the ability to change the size of individual blocks

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* Python 3 support (thanks to Thomas Kluyver)
* ``for block in grid`` style iteration
* ``Block`` now has an HTML representation for displaying individual blocks
* ``__str__`` methods on ``Block`` and ``BlockGrid``
* Ability to control block size via ``block_size`` keyword and attribute
on ``BlockGrid``