Move to using a CursorLoader in ChatWindow
Add screenSize to manifest, fix #154
first start dialog: improve Android 2.x and tiny screens
dialogs: fix EditText on 2.x
Remove 'cancel' from chat long-press menu. Half-fixes #157
Chat window updates

- Show a spinner during the loading of chats from the database
- When the user doesn't have any messages, show the software keyboard (if it already isn't showing)