Add unit tests for g.v()
Add unit test for dedup
Add groupCount unit test
Add error checking so copySplit can succeed
Add unit test for copySplit()/_()/fairMerge()
Fix g.v() by correcting scoping of this in callback
Merge pull request #45 from jcamins/ut

Additional unit tests
 - minor formatting
 - fix for getEdge, removeEdge
 - added tests for getEdge, addEdge and removeEdge
 - make it easier for wrapper modules to overwrite constructors
 - removing old examples
Merge remote-tracking branch 'origin/master' into consolefix

Conflicts:
	lib/graph-wrapper.js
Use globals for de-asynchronization
Add an async keyword for flagging asynchronous commands
Use default callback if no callback is specified