Added File SingleLens.py to show analytical and numerical solutions graphically in the case of only a single lens.  First Draft of WFS, for a single aperture, no plots.
Uses parameters from the paramsSensor dictionary in main
Merge branch 'master' of https://github.com/faitdivers/pyao into WFS_OneLens

Conflicts:
	src/main.py
Update to the new version of this file from the master.  It displayed a conflict when I attempted the pull request.
Revert "Update to the new version of this file from the master.  It displayed a conflict when I attempted the pull request."

This reverts commit b13f14e0da6167976c21d8066e03dde0f4816ceb.
Merge branch 'master' into WFS_OneLens

Conflicts:
	doc/WFR/wfr_doc.tex
Divides Single Lens solution into more generic functions.
Merge pull request #40 from faitdivers/WFS_OneLens

WFS Implementation for a Single Lens