[Merge] lp:~tiagosh/messaging-app/improve_startup_time into lp:messaging-app

[Bill Filler]

Review: Needs Fixing

Seems better but noticing a few issues:
1) The first time I load a conversation that has lots of sent messages at the end, I see the green bubbles paint initially without the arrow on the right but instead it shows an ugly black square that eventually turns into the arrow on the right of the bubble. This is definitely a new issue either with this MR or something in silo 3

2) From the main chat view, select a conversation to open from a contact. When the thread view is opened, instead of showing the contact name in the header it shows the phone number (and Add Contact button on right) for at least 1 second before switching to show the contact name and proper contact icon. This delay is much longer then it used to be. We should show the contact name immediately when showing the view, as we already know it because we selected it from the previous chats page and shouldn't have to first show the number then switch.

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https://code.launchpad.net/~tiagosh/messaging-app/improve_startup_time/+merge/232770
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