TST: Initial simple plotting test
TST: Use matplotlib image_comparison to actually compare plot output
TST: Add matplotlib and descartes to test requirements to strt running plt tests on Travis CI
TST: Use compare_images rather than decorator and switch back to unittest.TestCase
TST: Add baseline image for polygon plot image test
TST: Refactor plot test to put repetitive code in helper methods
TST: Add tests for plotting points and lines
BUG: plot_multilinestring doesn't take alpha parameter
TST: Better aspect ratio for lines plot
TST: Add baseline images
Skip the type tests for head and tail

Pandas commit c6d07a8 uses iloc for head and tail, which cause these
tests to fail. Skip them. The test for iloc is already being skipped.
Merge pull request #46 from jwass/skip_head_tail_test

Skip the type tests for head and tail
Merge pull request #47 from jwass/set_geometry

ENH: Add geometry property to GeoDataFrame
Merge pull request #43 from kjordahl/feature/plot_testing

Plot testing
Update total_bounds based on comments from @jwass on initial PR.
Merge pull request #48 from cfarmer/bounds

Update `total_bounds` based on comments from @jwass on initial PR.
ENH: Use _geom_col_name in GeoDF to switch geo col

Allows multiple geometry columns to be in a GeoDataFrame but you can switch
which is 'the geometry' with 'set_geometry'.