Minor fixes

* Added missing .classpath file for Eclipse support
* Fixed quoting issue in SootMethod 
  * SootMethod does quoting, HierarchySootMethod and MethodSignatureUtil do not
* Fixes in RootbeerClassLoader
  * m_classHierarchy was set to null
  * doDfsForRootbeer: check for [] in class name
  * doDfsForRootbeer: do not add root virtual_method to queue 
  (doDfsForRootbeer was done twice for root virtual_method)