Basic Mro Load Test (#260)

* Initial stab at a unitest class based mro test suit

* Adds data area for MRO

* Updated platform name on mro for consistency

* Update mro tests

* Updated data naif tests

* Updated sun_position test after light time correction update

* Reverted the data_naif tests

* Updated MRO testing

* Update to master of data_naif tests

* Added stderr output to convert_kernels

* Print statement

* stderr print statement

* Subprocess try except

* Added text=True

* Removed assert false

* Simplified load

* made mro tests verbose

* More changes

* More conftest changes

* Removed changes to conftest

* Loading kernels in fixture again

* Added prints and removed fixture furnish

* Added back in mro loads test

* Changed fixture scope to module

* Added path truncation through a relative path

* Bits of cleanup for conftest and the mro tests

* Added verbose in travis file

* Added check for list type

* Final clean up for the mro tests and conftest

* Cleaned up imports and added full diff to travis