Graphs: Added acceptance spec for Gharial
Exceptions: Added GraphNotFoundException
Database: Added graph creation and query functionality
Graph: Add basic with database reference and name
Remove randomly generated DBs after suite run
Graph: Forward send request to database
Graph: Extract vertex collection names
Graph: Extract names of edge collections
Ignore ctags file
Graph: Add vertex collections to the graph
Added VertexCollection
Graph: Add vertex collections to the graph
Graph: Fetch a single VertexCollection
Added CollectionNotInGraphException
VertexCollection: Raise an exception if the graph does not know the collection yet
Graph: Add method to check if a collection is part of the graph