More efficient memory usage

Doesn't save messages to a local array, it fetches a random message from my server's PHP.
Results:
    - Doesn't rape client memory
    - Doesn't download entire message array everytime someone sends a message
    - Easier on my server network and disk usage
    - Simpler

Todo: make sendRandom() use AJAX if you want AND can get it working to send the response text as a message.