Initial commit

Work in progress commit. Failing to calculate both sin and cos for
values of x in range 3<=x<7.5 and -7.5<x<=-3.
Fully tested and working

Accurate to 1e-8.
Added git .ignore

Re-factored to ignore compiler output.
Updated commenting

Updated comments.
Merge pull request #9 from ListlessValkyrie/FresnelCS

Actually did the merge this time :p