OTMessage: remove nReturnVal, return at the end of the block
OTContract: Remove deprecated tag "key"
OTPseudonym: Remove deprecated code (old key system)
Merge pull request #292 from lclc/keyTag

OTContract: Remove deprecated tag "key"
process attribute success in separate method
refactor OTContract::LoadEncodedTextFieldByName
do not use shared pElementExpected in OTMessage::ProcessXMLNode
do not use shared strDepth in OTMessage::ProcessXMLNode
Merge pull request #299 from mhamrle/otmessage_refactor

Refactor OTMessage
Make OTAPI more benevolent

Return error code instead of terminating process
Merge pull request #274 from mhamrle/asserts_in_otapi

Make OTAPI more benevolent
OTLog: -Wunused-private-field
Merge pull request #301 from toxeus/fixClang

OTLog: -Wunused-private-field
Removed duplicate code.
Made a header for mkcert.cpp (cleaning up duplicate declerations).
__TypeStrings: uniquify in opentxs namespace.
Merge pull request #302 from benma/cleanup

Duplicate code, declaration, identifiers