More features for Fireside Talk app

As suggested in previous post the support for transcript loading is added to Fireside Talk client. It took me a while to learn the concept of fragments and apply it to this project. Now the application uses different fragments as tabs when showing room activity.

There was some additional work to add some button and images in a way that looks acceptable on different platform and tune the layout little bit for landscape and portrait modes. The picture shows landscape mode where the buttons are moved to the left side to leave some extra space needed to show messages. There are shown as a row of buttons above the message area in portrait mode.