added status message to chat button, and toggle open/close
renamed the file according to functionality
modified js file name and adjusted the html code accordingly
changed button text to Open when chat is closed and already loaded
added chat to button title
added prototype for chat in a popup floating window
fixed the chat  in a popup window js for remote use
fixed it to work in edX
minor change
chat in popup window works locally and from GitHub in edX
merged with shmuel/develop