Load 1 data file and draw a plot

Program has been changed to work with the FTIR data
inverse x axis for FTIR standard plot

http://stackoverflow.com/questions/2051744/pyplot-reverse-y-axis
add grid

http://stackoverflow.com/questions/8209568/how-do-i-draw-a-grid-onto-a-plot-in-python
Merge pull request #1 from Joonia/develop

Develop merged to master