Return the namespace after having added it to a bundle
Added support for xsd:QName as a subclass of QualifiedName
- Renamed QName class to QualifiedName
- Refactored QName.get_namespace() and QName.get_localpart() into properties (QualifiedName.namespace and QualifiedName.localpart)
Fixed missing % in PROV-N exports of xsd:QName
Changed: valid_qualifier() becomes valid_qualified_name()
It generates only QualifiedName (not Identifier) if possible or None.
Fixed: Typo in the filename contants.py (closes #40)
Implement __repr__ hook for various classes

This improves usability when working with instances in a REPL
environment.
Changed: added more information to repr of relations
Changed: using PROVN representation for the repr of Literal
Fixed: formal_attributes returns None for non-existent attribute values
Merge branch 'cbmi-repr'
Write out boolean type in PROV-N
Display boolean value as 0 or 1
Merge pull request #43 from cmaumet/master

Write out boolean type in PROV-N
Fix bundles in document graph output
Using StringIO instead of BytesIO
Fixed namespace scope inheritance in decoding bundles
Refactored the intefacing classes, added ProvJSONEncoder and ProvJSONDecoder
Fixed typo in the previous commit
Fixed resolving QualifiedName strings whose prefixes belong to a renamed Namespace
 Namespace pointing to the same URI of an existing namespace will not be added to NamespaceManager but will reuse the existing namespace
Added more QualifiedName constants for convenience
Fixed: UTF-8 encoding for prov.dot
Renamed Literal.get_value(), Literal.get_datatype(), and Literal.get_langtag() and made them properties
Added JSON test filed from ProvToolbox and unification tests
All the ProvToolbox's JSON was generated by the version https://github.com/trungdong/ProvToolbox/commit/bf13da78a5cdc409571fc9cbe9454597e4dd31fc with the dictionary-related files removed.
Unification test cases are taken from https://dvcs.w3.org/hg/prov/raw-file/default/testcases/process.html (only 9 at the moment)

Note: These are the files missing in #47