Removed OTCleanup in OTMessageBuffer.
Removed OTCleanup in OTMessageOutbuffer.
Removed OTCleanup in OTRecord.
Removed OTCleanup in OTRecordList.
Removed OTCleanup in OTCronItem.
Removed OTCleanup in OTCredential.
Removed OTCleanup in OTPayment.
Removed OTCleanup in opentxs-script/main.cpp.
Merge pull request #119 from murrekatt/otcleanup

Replaced OTCleanup in various files with std::unique_ptr