Implement sharing, view+add comments, replying messages 

Sharing now working on listing details page.
Link to comments on listing details page
Can now add comments & reply to messages

Todo: Create message (to another user)

Remove index2.html which is a test file.
Clean up popup message (may think how best to do this in the future)
Why need to try catch listview("refresh")?
On loading page after adding comment/replying messages, back button
disappears