Windows and Mesh View

• add down-sampling capability to _plot2DImage as per simpeg/simpeg#537
• Changes for windows compatibility:
  • long changed to long long
• Changes for appveyor testing:
  • needed to cd into a different directory to do the tests
• Setup.py changes:
  • Used numpy's distutils for package management
• This can now be built and installed without any special arguments to the setup.py file. For example, python setup.py build and python setup.py install
  both work.
• The setup.py files within each subpackage take care of cythonizing and attaching the extensions, making the main setup.py file a little cleaner.
• This version was able to be pip installed on my Windows machine, should consider building wheels for distribution without compilation.

Updates to testing and pypi

This should be slightly smoother to install on pypi, and is now tested on windows.

Initial release to PYPI

Includes meshes for:

• tensor product mesh
• cylindrically symmetric mesh
• curvilinear mesh
• octree and quadtree meshes

This is the initial prot from the SimPEG code base.