Bump version for next release
Remove errant logging message about chain number

Rely on stan::common for this kind of reporting.
Fix argument handling for HMC
Fix corner case when calculating number of digits in summary
Report chain number in progress
DOC: Add notes on how to release Mac OS X wheels
Format sampling progress messages better
DOC: report travis-ci status from master, not develop
Check for user interrupt during sampling and optimization
TST: Add test to verify optimizing example from documentation works

Closes #96
Really fix bug where pip -e would not run install_clib

Hopefully closes a long-standing bug where one could not install from source
with ``pip install -e .``

This change was previously reverted. Hopefully this version will last.
CI: Build with --quiet on to avoid exceeding travis ci's log limit
Remove unnecessary calls to logging.basicConfig

Closes #97
Revert "Really fix bug where pip -e would not run install_clib"

This reverts commit 3e2523867cb39fe836de6d05eb75e82aa77ae2c8.
Improve performance by using Cython classes and functions

Turns PyStanHolder and PyStanArgs into Cython extension classes. Chains are now
wrapped directly using PyArray_SimpleNewFromData. Substantial speed improvements
derived from rewriting get_kept_samples and get_samples in Cython.
stanfit4model.pyx needs numpy libraries to compile

Add ``np.get_include()`` to include_dirs
Merge branch 'feature/pystanholder-refactor-alt' into develop
Add speedup for extract when permuted is False
Speedup ess and rhat calculations by getting them both at once
Speed up calculation of ess and splitrhat by passing a MatrixXd to stan

Summary still takes far too long but this is a vast improvement over the status
quo.

Closes #90