Rename: OTmessage -> notaryMessage.
Rename: OTuser -> nymData.
Message/API rename: checkServerID -> pingNotary.
Rename: serverID -> notaryID (all variants).

Those changes were produced by:
find . | egrep "(cpp|hpp)$" | xargs sed -i -e 's/serverI[dD]/notaryID/g'
find . | egrep "(cpp|hpp)$" | xargs sed -i -e 's/ServerI[dD]/NotaryID/g'
find . | egrep "(cpp|hpp)$" | xargs sed -i -e 's/server_id/notary_id/g'
find . | egrep "\.proto$" | xargs sed -i -e 's/server_id/notary_id/g'
Merge pull request #445 from benma/renamings

More Renamings
Rename: deleteNym -> unregisterNym.
Rename: digitalAssetContract -> instrumentDefinition.
Merge pull request #447 from benma/renamings

Renamings
Moved defaults for socket into socket class.
Removed mutex from socket.
Removed socket default class.
Removed unused socket init.
No need to terminate for no config.
No need to have a check for has context.
Removed Socket_ZMQ4 and moved in logic into OTSocket.
Moved member variables last in socket.
General cleanup.
Removed IsInitialized from OTSocket API.
Automatically init the socket.
Always create a context for the socket.