Extracts distortion models from the Line Scanner and Framer cameras into its...

Extracts distortion models from the Line Scanner and Framer cameras into its own function set (#172)

* Moved transverse distortion from line scanner into new file

* Updated fixtures for distortion tests

* Forgot a semicolon

* Extracted radial destortion, and built associated tests

* Removed invertDistortion commented code from Linescanner

* Reconstructed distortion functions return results

* Incorperated invertDistortion function

* Corrected spelling, and removed commented out functions

* Renamed all dpoint variables to distortionPoint

* Removed computeUndistortedFocalPlaneCoordinates function

* Renamed distortionPoint to undistortedPoint and distortedPoint where applicable

* Fixed typo

* Removed doc string parameters

* Further extracted transverse destortion out of the Framer