added function to get all graph and collection classes
Added error for abstract instanciation
collection edges and graph are no longer included in the definied calsses lists
synced test to the new format of fetchFirst/Last
For an unexplained reason while testing with webtest in loop, default value of edgeAttributes={} in graph.link was overinden by a previous the provated of the previously created edge
trigger validation problems.
Solved the issue by removing the default value
added tests for graph.unlink
queries are now iterators that transparently ask for new bacthes when needed
It is now possible to define the _key attribute of a document before saving it:
doc._key = "whatever"
print the _id
graphs now support traversal