fix warpimage and projection = 'hammer' (issue 100)
fix warpimage with projection = 'hammer' (issue 100)
fix bug in previous commit
add hammer example to test for issue 100
raise error message when warpimage is used with celestial=True (issue
101)
Merge pull request #102 from jswhit/master

fix warpimage for projection = 'hammer' (issue 100)
preliminary support for projection = 'rotpole'
fix coastline drawing for projection='rotpole'
doc update
add new test_rotpole.py to MANIFEST
fix clipping of stray coastline segments
add projection='rotpole' example
add some comments
simplify comments
Merge pull request #104 from jswhit/master

add projection='rotpole' (rotated pole transformation)
streamline
Merge pull request #105 from jswhit/master

update test_rotpole.py example