Converted BaseMap unit tests to py.test tests. Commented out invalid test comparing Map and pyfits headers (see note in comments for reasoning.)
Converted BaseMap unit tests to py.test tests. Commented out invalid test comparing Map and pyfits headers (see note in comments for reasoning.)

dpshelio/sunpy,mjm159/sunpy,dpshelio/sunpy,Alex-Ian-Hamilton/sunpy,Alex-Ian-Hamilton/sunpy,Alex-Ian-Hamilton/sunpy,dpshelio/sunpy,mjm159/sunpy