refs #24: fix Version matching again now for matching normal 0.12.1 version
fixed Version unapply method
added saveAsDot method to IvyGraphMLDependencies that generates a simple dot file
added dependencyDotFile Setting and dependencyDotTask
updatet to 0.7.1-SNAPSHOT
removed com.typesafe.akka:akka-actor from libaryDependencies
there was a resolving problems so the test failed.
added testDotFileGeneration
it is a sbt-scripted project to test the dot generation process.
improved dot generation
added dot settings to README.md
more customisation for dot output

with dependency-dot-head you can now  define your own dot head.
dependency-dot-node-label lets you customise the labels of the nodes
Merge commit 'pull/25'

Conflicts:
	src/main/scala/net/virtualvoid/sbt/graph/Plugin.scala
bump version