GMTInvalidInput error for basemap

[willschlitzer]

There is an if statement under basemap in base_plotting.py to raise an exception if B, L, or T aren't included in kwargs. The aliases for basemap do not include T, so that requirement cannot be completed. In #729 I removed "T in kwargs" from the if statement and changed the text of the exception to display the PyGMT parameter names.

It looks like the T parameter on the GMT docs is in reference to adding a compass or rose to the figure; I can add Tm and Td to the list of kwargs to check for if that is the case.

[welcome]

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