Neuronvisio

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- Added a new tab to have a ModelDb explorer inside Neuronvisio
- Integrate the ability to download and extract a NEURON model from ModelDb
- Ability to load the model directly from Neuronvisio
- Used the logging python system through the package
- Updated the docs to explain the ModelDb integration.

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- New API to select sections directly from the commandline
(`controls.select_sections()`)
- Animation Timeliner set up only if simulation has ran or be
reloaded.

===================

- Animation ported to the new infrastructure.
- Updated the requirements with setuptools (needed for paver)
- Animation timeline accept an arbitrary time and display it on the
visio window.

====================

- Added the function to plot a 3D plot to the manager (manager.plot3D)
- Animation can will be enabled if any simulation is ran, either from the gui
or the code.
- Completely rewrote the visualization method. Now completely integrates in the mayavi pipelines,
therefore axes and other modules/filters can be added at will
- Now it's faster. A lot faster
- All the segments are plotted, not only the section. This is extremely helpful with geometrical reconstruct
neurons and networks.
- Updated the docs and the screenshots.

====================

- Updated the version recall to GitPython 0.3.1 (used only if present!)
- HocVector into NumpyArray for saving with swap in place, to reduce overhead
- Restructured the package for an easier installation
- Added the possibility to build documentation offline

===================

- Fixed the picking of the cylinder. Possible to select a cylinder
clicking anywhere.
- Possibility to plot points instead of a lines
- BaseREf class are discriminated through the group id and not any more on
class base.