Rename digitalAssetContract to instrumentDefinition.
Rename OTmessage to notaryMessage.
Rename OTuser to nymData.
Rename deleteNym to unregisterNym.
Rename attribute serverID to notaryID.
Rename checkNotaryID to pingNotary.
Merge pull request #136 from benma/master

Update docs with new message and doctype names
Rename assetType(ID)? attributes to instrumentDefinitionID.
Merge pull request #138 from benma/master

Rename assetType(ID)? attributes to instrumentDefinitionID.
Rendering converted to single-page output, updated README, misc. fixes.