Initial (incomplete) COA implementation. #44
Add timestamp support to COA API.
Add Handling to COA API
Revise COA binding to avoid duplicate xmlns attribute for coa. Add test for COA API, and revise API to pass tests.
Merge remote-tracking branch 'origin/master' into coa_impl
Merge pull request #79 from STIXProject/coa_impl

Course of Action API Implementation