Added Kostas' functions from the hackathon; added ExecutionEnvironment member to Graph
fix merge conflicts with master
added execution environment to create calls in test
suppress warnings
Added mapEdges
Added mapEdges tests
Removed unnecessary edgeKeyType field
fix conflicts with current master
empty test todos for implemented operations
fix count to work with Datasets of tuples, added test for numberOfVertices, numberOfEdges
static inner classes for getVertexIds, getEdgeIds, isWeaklyConnected, tests for former 2
isWeakly connected corrections and test
Updated the Graph constructor
Added mapEdges to the tested methods
Merge pull request #6 from balidani/master

mapEdges implemented
Added tests for addVertex, removeVertex, addEdge and union
fromCollection(vertices, edges) implemented and tested
Merge pull request #13 from andralungu/fromCollection

fromCollection(vertices, edges) implemented and tested
added create methods from set of edges
Added removeEdge, added more tests