Polytope

- classes `polytope.Polytope`, `polytope.Region`:
- add methods `translation`, `rotation`
- require `setuptools >= 23.0.0`
- require `numpy >= 1.7.1`
- require `scipy >= 0.18.0`

- support Python 3
- silence `cvxopt >= 1.1.8`

- require `scipy >= 0.16`
- use `scipy.optimize.linprog` if `cvxopt.glpk` fails to import
- PEP440-compliant version identifier `vX.Y.Z.dev0+commithash`
- test on Travis CI

- silence GLPK solver's output in `cvxopt`
- version that includes commit hash, when available
- define version in `polytope/version.py`

This initial release has very few changes since its break from TuLiP,
and is primarily intended to provide a reference version that easily integrates
with legacy code developed assuming polytope is a part of TuLiP.