Merge pull request #32 from STIXProject/v1.0.1.0

Merging v1.0.1.0 branch into master
Update README.md
Update Versioning policy in README.
added markings
Remove unused CybOX classes from the bindings
Fix more bindings
Add failing test for Incident categories
Fixing a bug in buildChildren of the CategoriesType: it must be add_Category rather than set_Category.
Merge pull request #38 from zeroq/master

Thanks, @zeroq
Call to export function of Observables_Type does did not work: superfluous argument nsmap, wrong namespace and wrong level.
Add failing test for StructuredText
Set correct namespace and level on Structured_Description
Added _binding and _namespace class-level properties to api classes
Changed to_obj() methods to reference self._binding. Added python-cybox constraint to setup.py
Updated copyright to 2014
Initial commit of namespace parsing code
Added first pass at intelligent namespace parsing to stix.Entity.to_xml(). Removed to_xml() from STIXPackage
Added support for outputting idgen namespace
Added support for exporting schemalocations
Fixed issue where CybOX default vocabularies namespace and schemalocation were not being exported