license update

limit 'compare to files in project' to 1000 files (settings: 'limit')

move 'options' to 'run_diff' method

added 'cmd' argument support, so you can assign an external editor us…

…ing kwargs instead of settings

updated README and fixed whitespace

fix attempt for 'ValueError: path too long for Windows'

FIX

readme update and misc fixes. resolves colinta#26 and colinta#31.

Merge branch 'st3'

fix newline bug