Pygtc

* Drop support for matplotlib < 2.2 and numpy < 1.7.1
* Take advantage of "new" built in axis-label alignment (thanks samueldmcdermott)
* Dropped `holdRC` keyword argument now that minimum matplotlib version is greater than 2.0

* Add `packaging` package to explicit list of deps to fix import bug.
* Fix bug where plot legend did not respect truthLineStyles
* 1-D plot scaling is now always 5% above the maximum datapoint (previously it was "auto-scaled")
* Removed legacy test baseline images from the codebase and regenerated new test images that incorporate the 1-D plot scaling fix
* Fixed bug in Python 2.7 support that was introduced in 0.4.0

* Update deprecated `normed` keyword for matplotlib and numpy histograms to
`density`
* Add version number to package itself
* Add tests to the distribution
* Verified matplotlib 3.0 support
* Migrated testing from `nose` to `pytest`
* Note: Version 0.5 and up will drop support for matplotlib < 2.1 and numpy < 1.7.1. Version 0.4 will still recieve minor version bumps to address bugs.

* Hardlink the readme image to github so PyPI can see it

* Fixed bug due to changes in the OSX backend for matplotlib 2.0.
* Addressed deprecation warnings due to changes in matplotlib 2.0 in a
backwards compatible way with matplotlib 1.5.
* Updated color scheme to align with new matplotlib 2.0 defaults.
* Fixed bug that can mess up axis limits when one column doesn't have data
* Changed some calls to axis plot methods to explicitly call the axis method instead of relying on pyplot to get it right.
* Add a hack to fix the scaling of the lower-right 1D panel for matplotlib versions < 2.0.

* Fixed bug that was causing a crash in Python 3.5