Pysurfer

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- Added control over the width of outlines when plotting the borders of
annotations or labels.
- The visual display of the surfaces was improved by using surface normals.
- Made colormap specification in Brain.add_data and Brain.add_contour_overlay
more flexible, with better defaults.
- Brain.save_montage() can now produce 2d grids of views in addition to
horizontal and vertical arrangements.
- Fixed some installation issues and added explicit checks for dependencies
on install.
- Updated the installation docs with information about getting PySurfer
running on OSX, and changed the official environment recommendation to
Anaconda.

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Enhancements
~~~~~~~~~~~~

- Display data from both hemispheres simultaneously
- Display multiple views simultaneously
- Toggling Mayavi toolbars
- Use nibabel for IO functions

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Fixes
~~~~~

- Reverted change in io.py that broke Python 2.6 compatibility
- Updated traitsui import while keeping backgrounds compatibility

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Enhancements
~~~~~~~~~~~~

- TimeViewer GUI to control data exploration in the time dimension
- Support for reading and visualizing MEG data from MNE
- Function to project volume-based data using mri_vol2surf
- Label routines can read scalar data and threshold visualization
- Utility function to smooth overlay data along the cortical manifold
- Example for displaying parcellation-based ROI analysis results
- Example for displaying ROI labels
- Example for plotting probabilistic labels
- Improved color flexibility using matplotlib for many visualization modes
- Exposed alpha channel for many visualization modes

Fixes
~~~~~

- Big-endian overlay data should now display properly on 64-bit systems.
- Colorbar text displays properly on light backgrounds
- Lights are oriented depending on hemisphere so surfaces are equally lit