freevariable -> variable; remove jacobian det stub
Merge pull request #168 from twiecki/pymc3

Disabling opening of a window when running example unittest.
 refactored function compilation and graph functions
adjusted step methods and examples for change
delete split hmc
Merge remote-tracking branch 'origin/pymc3' into pymc3
large scale refactoring files organization
removed lowflip hmc
cleanup
cleanup
readded hessian computation and added some small tests
specified the theano functions to import rather than *
fixed multi sampler and added tests
Started adding docstrings to distributions
More docstrings for distributions
Yet more docstrings for distributions
Bug fix and docstring cleanup in distributions
added summary plot for trace
history -> trace
ARM example errors