Moved SlicePredicate to writer since that is what it is for
Moved test to correct package
Added a sketch of how tests might look with Degraph and Scalatest

- Made scalatest a compile time dependency (this will go away again for most of Degraph once it is split in components
- Added tests which are dummys right now
- Added primitive dummy implementations of the matcher
introduced type Violation
test for obtaining the classpath
upgraded scala graph
Merge branch 'master' of github.com:schauder/degraph