Ccplot

* Fixed an integer division issue in argument parsing on Python 3.

* Fixed deprecation warnings in recent versions of numpy and matplotlib.
* Fixed colormaps arising in recent versions of matplotlib.
* Fixed bytes vs. str handling in Python 3.
* Support for Python 3 in tests.

* Support for Python 3.
* Support for new versions of matplotlib.

* Fix inverted layer products.
* Fix type casting error arising in recent versions of numpy.
* Fix MODIS swath dimension mapping
(values on the 180th meridian are misplaced).
* Fix matplotlib image interpolation.

* Switched to interp2d_12 interpolation.
* Fixed compilation on new Ubuntu/Debian releases.

* Added support for arbitrary dataset plotting (experimental).
* Added ccplot API functions (experimental).
* Removed dependency on PyNIO. ccplot now uses its own HDF reading module,
interfacing with libhdf4 and libhdfeos.
* Support for Windows.
* Support for Mac OS X.
* CALIPSO LIDAR altitudes are now read from the product file instead of being
hard-coded in ccplot.
* Automatic unit testing performed by Travis CI.
* ccplot now looks for colormaps in a directory relative to the executable.
This fixes installation in non-standard paths.
* New man page in ronn.