Initial commit of Incident implementation. Much work to do be done\!
Changed default XSI_TYPE value on VocabString base class
Added more Incident functionaity. Initial commits of Confidence and Statement
Removed *Literal functions from bindings
Move data_marking out of common
Update Marking classes and implement TLP extension
Add SimpleMarking extension and tests
Add test for STIX Header, including Marking
Merge pull request #55 from STIXProject/data_marking2

Merging data_marking2 branch into  v1.1.0.0 branch.
Updated stix_core binding for STIX v1.1
Changed timestamp_ref to timstamp in stix_core binding
Updated stix_common binding to align with STIX v1.1
Merge branch 'v1.1.0.0' of github.com:STIXProject/python-stix into v1.1.0.0
Updated campaign binding to align with STIX v1.1. Changes hasContent() logic in stix_common binding
Fixed issue where binding was overwritten
Fixed small issue with method name
Updated course_of_action binding to align with STIX v1.1
Updated data_marking binding to align with STIX v1.1
Fixed issue with CourseOfActionType not outputting xsi:type
Updated exploit_target binding to align with STIX v1.1