MODIFIED: messageView layout

Changed so that in later versions of android only the key exchange button would be selectable.
FIXED: key exchange bug

Mixed up the initiator flag. The Number's initiator flag must be set to true when the USER is the initiator. If the contact is the initiator then the flag is set to false. It is slightly confusing but in order for the flag to work correclty it has to be about the user (and therefore the inverse of what the contact is).
ADDED: new activity keyExchangeManager.

The new activity will handle key exchange messages and allow for the user to choose which ones to respond to (versus the current automation).
Merge branch 'master' of github.com:tinfoilhat/tinfoil-sms
Merge branch 'master' of github.com:tinfoilhat/tinfoil-sms