Bumping version to 0.9.9.3
Switch to a more heavily TOFU model for identity keys.

1) There is no longer a concept of "verified" or "unverified."
   Only "what we saw last time" and "different from last time."

2) Let's eliminate "verify session," since we're all about
   identity keys now.

3) Mark manually processed key exchanges as processed.
Add appropriate text for manual case when identity is trusted.
Clean up list of identity keys.
Remove checkboxes from the multi-select UI
Clean up identity key view activity
Update strings.xml

Minor edits.
Add a 'mark as read' button to expanded notifications.
Fix for NPE on null FROM in MMS header.
Fix for NPE when group selection fragment is no longer attached to activity.
Merge pull request #181 from thoughtbox/patch-2

Some minor language.
Fix for contrived NPE on invalid recipient during conversation compose.
Resolved a few MMS issues.

1) Fixed the "Unsupported Encoding!" problem.

2) Workaround for the Sprint issue, where the MMSC is adding a single
   extra byte to the end of each encrypted message.

3) Fixed the "large blob of base64 text" on encrypted MMS problem.
add BUILDING instructions
Merge pull request #208 from richo/features/submodule

Easier development setup
Catch attempts to dial on devices with no dialer.
Lighter check
Updated translations
Bumping version to 0.9.9.4
Theme Support

1) Broke out the UI elements of the major Activites into stylable
   attributes.

2) Created a 'light' and 'dark' theme for the newly stylable attrs.

3) Touched up some of the UI spacing.

4) Implemented dynamic theme switching support.