Frame Chain Update (#216)

* Significant update to framechain computation

* Updated default config for dawn

* Initial update to isis formatter

* Got correct rotation

* change to compute time dependent frames

* Further isis formatter updates

* finished compling to the tests

* Added back NaifSpice import

* Added networkx to environment file

* Updated doc strings for the FrameChain class

* Updated FrameChain with class function for spice and overloaded add_edge method

* Updated isis formatter to use node ids and not the time dependent source

* Updated test fixtures to use the new add_edge method

* Rmoved networkx import from data_naif