Fix typo in TestBasic.test_rcparams that caused a fail
Merge pull request #134 from cdeil/rcparams-test

Fix typo in TestBasic.test_rcparams that caused a fail
Added WCS wrapper that implements _as_mpl_axes
Change docs to use simpler ``projection=`` interface
Updated image tests to use new API
Added separate section on initializing WCSAxes since there are now a number of ways.
Fixed bug in angle formatter/locator
Fixed tests