[docs] Created CONTRIBUTING. Overhauled DEVELOPMENT.
[docs] Fixed typos in README
[docs] Added intro for Aruba and minor tweaks
[docs] Added an "Overall Design" section
[docs] Made real links out of cucumber and aruba
[docs+rubocop] Eliminated unneeded newlines with rubocop --auto-correct
Merge pull request #27 from jedcn/docs

Update "contributing" and "development" documentation