use new sbt-cross-building plugin
add sbt 0.13 to the cross building versions
fix dependencies to use versions which are available for scala 2.9 and 2.10
workaround for jrudolph/sbt-cross-building#24
more warnings
use linked plugins.sbt for all scripted tests
give every sub-project its own directory in scripted test
fix test to use scala version known to have no conflicts
reorganize ignoreMissingUpdate to rely on `updateConfiguration in ignoreMissingUpdate`
add support for sbt 0.13, fixes #35
Merge branch 'sbt-0.13'
fixes #36: Graph.insertBar doesn't take maxColumn into account leading to StringIndexOutOfBoundsException