Updates to be compatible with Scala IDE master

Name of the junit bundle has changed
Export scalat-finders jar to be visible in the test project
Bump weaving hook version.
Cleans up unused variables & imports

Also removes some minor deprecations & syntax linting.
Hard coded changes to build against Scala IDE master
Bump up Scala version to 2.11.2 for profile scala-ide-4.0-2.11, and rectify the scala-ide url.
Bump up default scala version and scala-ide-4.0-2.11-luna to 2.11.2.
Exclude jar file from being passed into -p.
Adapt to new ScalaPlugin / ScalaPresentationCompiler API in scala-ide