Sketched functions to do necessary convergence calculations
Initial commit of Gelman-Rubin convergence criterion
Extensive docs for Gelman-Rubin criterion calculations
A file for examining the properties of the GR criterion

Not a test per se, but can be used to run multiple chains for a simple
model and see how the GR convergence criterion decreases with increased
chain length.
Initial commit of Sphinx docs directory
Doc fixes to convergence.py to render math correctly
Added nose tests for calculations

Also fixed a critical bug in the check_chain_lengths function
Added .swp files to .gitignore
Moved test_convergence to examples directory
Fixed call to synthetic data function

And removed spurious setting of random seed
Merge remote-tracking branch 'jmuhlich/master'
Changed eigenvalue clamp from 0.25 to 0.1
Merge remote-tracking branch 'jmuhlich/master'
Changed hessian clamp back to 0.25
cleaned up sphinx config

* put a gitignore in _static to keep it around
* removed ext/numpydoc in favor of an external copy