CMake: don't build binaries for Android
Merge pull request #414 from toxeus/android

CMake: don't build binaries for Android
Rename createUserAccount messages to registerNym.
Rename the rest of createUserAccount to registerNym.

Client API, enums, etc.
Merge pull request #415 from benma/registerNym

Rename createUserAccount to registerNym.
opentxs-core: ruin friendships
Merge pull request #419 from toxeus/ruinFriendships

opentxs-core: ruin friendships