Update of Base (#163)

* Add getPosition with coefficients

* Add some exceptions and associated test

* remove debug statements and change test name

* Updated to use gsl for polynomial evaluation and separated out into a helper function. Swapped order of coeffs, other changes in response to review comments

* Added a couple of suggested tests and updated documentation

* Modify IsisLabel driver for refactor. Update test

* Create new test for ISIS Label mixin, remove changes to ISIS spice test, and updated Isis Label for review comments

* initial work on base

* Minor typoes fixed and base test updated to run

* switchf from using older @abstractmethod @property nested to using just @abstractproperty

* Fix inheritance order in tests class

* Remove unneeded property redefinitions in test class

* Disabled data_isis tests until it is re-written

* added __init__ for usgscsm formatter

* Cleaned up base function names

* Removed base Driver test

* Massive name clean up

* Fixed uppercase self

* Removed underscores