AddVertexEvent and AddPropertyEvent events working
AddEdgeEvent, RemoveEdgeEvent, and RemoveVertexEvent working
Merge branch 'master' into events
removed thread as parameter
add remove property event
Merge remote-tracking branch 'origin/master' into events

Conflicts:
	securegraph-accumulo/src/main/java/org/securegraph/accumulo/AccumuloGraph.java
	securegraph-test/src/main/java/org/securegraph/test/GraphTestBase.java
Merge pull request #22 from altamiracorp/events

Adds events to various operations in SecureGraph (add vertex, add edge, add property, etc).