Added LUT generation to curve adjust
Extended documentation
Created sigmoid plot
Added gnuplot as dependency
Created seperate makefile for docs
New makefile for docs
Fixed docs
Improved the README
Made script for creating the input images
Script now converts to value line-per-line
Moved constants to seperate file
First sigmoid function works, needs cleanup
Did some cleanup
Improved documentation of curve_adjust
Added formula and LaTeX as dependency
Added gamma and negate functions to curve
Improved documentation of curve_adjust
Added Lenna as test image
Merge branch 'feature/curve_adjust' into develop