Added framing test for setFocalPlane. (#89)

* Added framing test for setFocalPlane.  Also enabled the testing of protected member functions, and modification of the ISD within the test fixture.

* Added jupyter_notebooks folder to CSM-CameraModel.

* Refactored setFocalPlane test so that the ISD changes are made local to the test (and not global).

* Refactored tests for setFocalPlane, distortionJacobian to modify Isd parameters and use them in tests.

* Added two new failing tests and a printIsd() helper function in the FrameIsdTest fixture to help with debugging.

* Fixed the failing tests.  They were due to the Jacobian being unexpectedly singular.