* Update memory requirement description per #326
* Fix R warning with extra regressor; disallow constant extra regressors.
* Fix unit test broken in new pandas
* Fix diagnostics unit tests for new pandas
* Fix copy with extra seasonalities / regressors Py
* Fix copy with extra seasonalities / regressors R
* Fix weekly_start and yearly_start in R plot_components
* Fix plotting in pandas 0.21 by using pydatetime instead of numpy
* Version bump
* Update README for new version
* Fix missing columns in SHF with extra regressor
* Resolve conflict
* Change comments and add error column to output DataFrame
* Change file structure
* Update
* Modified diagnostics
* Update diagnostics.py following the advice on Github
* Add tests and documentation
* Change copy method into Prophet class and reflect comments
Including pystan & Cython in the setup_requires caused
pip install to fail with a complaint about missing
Cython and numpy dependencies. Removing the explicit
Cython/numpy dependencies allows pip install to
complete successfully (pystan pulls in Cython/numpy).
The vector/matrix operations fail to compile in windows due to eigen
incompatibility with windows compiler. Here we opt to use a non-
vectorized model for windows platform.
