Slack action

Added more details about how to get the token. Improved the channel selection dialog, it will remember your previous selection.
Rackspace Cloud Files

Fixed "delayed" CDN issue. Now if you enter an existing container, it will update its CDN setting based on what you selected the last time for enabling CDN or not.
Rackspace Cloud Files

Small refactorings to the action.
Rackspace Cloud Files

Increased action version number
Merge pull request #13 from alexchiri/master

Slack and Rackspace Cloud Files actions updates