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
Added __str__ and __unicode__ methods to StructuredText
Added support for related observables in Incident
Added observable property to Indicator to align better with schema and hopefully the expected behavior. This may need to be rethought later.
Added missing _base_type mapping in common/__init__.py for RelatedObservable
Implement Exploit Target API. Create test class for exploit target.
Modified VocabString to support extensions
Initial, untested, commit of affecte_asset and property_affected modules.
Added affected_assets to Incident structure
Fixed bugs with Affected Assets related code in Incident
Fixed issue in from_dict() method in Incident class
Changed test module filename to align with others
Merge pull request #81 from STIXProject/exploit_tgt_impl

Implement Exploit Target API structure
Initial commit of vulnerability field on Exploit Target
Merge branch 'exploit_tgt_impl'