Correct contextual send language.

1) Use "secure" and "insecure" vs "encrypted" and "unencrypted.

2) Use MMS instead of SMS where appropriate.

Fixes #1602
Validate MMS delivery destination.

We can't depend on validated Recipients anymore, so this adds
parity to the validation the SMS transport does now.

Fixes #1592
Fixes for outgoing SMS/MMS direct and fallback behavior.

1) Correct MMS fallback settings.

2) Prevent SMS/MMS messages from leaking out under certain
   circumstances when they shouldn't.
Fix UI side of broken MMS fallback.

1) Actually tell the SendReceiveService to send the MMS if it is
   one.

2) Display the correct string (SMS vs MMS) in the fallback dialog.
Fix the "Tap for X fallback" labels.
Fix more leaked service connections

PassphraseRequiredMixin might check for a bound service at a time where
the bind has been requested but the service connection has not been
established yet, and therefore fail to call unbindService, leading to a
leaked service connection. This fixes #1518.
Fixes "subtitle is not updated when select all is pressed"

// FREEBIE
add custom phone number type
Always show the time of the received message.
move FLAG_SECURE to PassphraseRequiredMixin

Fixes #1402
// FREEBIE
Add Travis CI config.

//FREEBIE
Merge pull request #1614 from mcginty/contact-list-security

move FLAG_SECURE to PassphraseRequiredMixin
add section about submitting useful bug reports
remove ReviewIdentitiesActivity

// FREEBIE
temporarily disable encrypted backup

// FREEBIE
Merge pull request #1631 from mcginty/disable-encrypted-export

temporarily disable encrypted backup
Fixing race condition and other mistakes. Fixes #1603.

// FREEBIE
Merge pull request #1630 from mcginty/remove-keys-list

remove ReviewIdentitiesActivity
Remove unused files.

Fixes #1522

// FREEBIE
Replace XML serializer in plaintext export

Fixes #342

- using regex pattern/matcher to escape chars below 0x0020 and
  above 0xd7ff
- using String.Replace to escape XML entities
- changed XmlPullParser from Xml.newPullParser() to
  XmlPullParserFactory parser to fix import on GB