Stopped recreating the RDF graph on every call

- Modified connection to check synapse types on create
Removed uploader annotations for adding statements

- Uploader annotations are to be handled through version control on database
  serializations
- Removed automatic wrapping with Data for DataUsers
- Reverted a change to _add_to_store which made uploads even slower
Wrote an open() method for Data
Fixes issue (#20) on openworm/PyOpenWorm
Added SimpleProperty tests
Adding SimpleProperty and Property
Modifying to use Property
More properties stuff (Network and Connection)

- Changes to WormTest
Adding export.xml needed for test
Asserts property
Properties or Cell
Reading graph patterns from triples
Merge branch 'alpha0.5' of chunky.cs.utexas.edu:PyOpenWorm into merge

Conflicts:
	PyOpenWorm/cell.py
	PyOpenWorm/dataObject.py
- Documenting some identifier generation
More with properties
Moved more read/write functionality into Property and DataObject

- Distinguished DatatypeProperties from ObjectProperties
- Adjusted some tests
Make load() actually load things...

- Converting asserts() into an ObjectProperty
Raising an error when attempting to use an un-opened graph store