Fixed failing tests on OSX.
Merge pull request #208 from pelson/osx_tests

Fixed failing image comparison tests on OSX.
index file
updated toctree
updated indexing
Merge remote branch 'cpelley/doc_index' into v0.6.x

* cpelley/doc_index:
  updated indexing
  updated toctree
  index file
  Moved master up to v0.7.x
plotting shapefiles tutorials
actions made on plot shapefiles