Update README.md

(Remove TODO, it's now in a trello board)
Fix MainWindow mistake
Use SSKeychain to store / retrieve api key
Add an icon
Handle error
s/key/token/
Better user experience
* Store channel in keychain as well
* Add a 'progress indicator' window
wat
Project changes
Use CIS as default prefix
Change copyright
Use window controller
(AppDelegate started a new diet)
open cisimple in your browser
s/key/token/
Progress view wording
Add button leading to cisimple in pref panel
First launch popup wording / remove go to website button
Error popup wording
Fix progress view message
Capitalize
Close preferences window after connecting
Preload pref window