Add function to setup trim trailing whitespace functionality
modify edconf-find-file-hook to invoke it
use the built in delete rather than compiled lisp delete*, acheives the same thing without a warning on byte compile.
renaming vars for brevity and to better show what is happening
s/set/trim/ in var name
Add name to CONTRIBUTORS and remove strikethrough in README
Merge pull request #9 from stevejordan/feature-trim-trailing-whitespace

docs updates