Remove unneeded libs and defines from cppimport

This hopefully improves compile/link time

NOTE: Only tested against clang3.5
Export empty expression statements as empty lines
Handle final and abstract modifiers when importing Java code
Add convenience methods to Class that return the implicit base if any
Add support for the 'super' keyword
Add partial support for importing the 'super' keyword
Merge pull request #43 from lukedirtwalker/improve_cppimport

Remove unneeded libs and defines from cppimport
Update the JavaImportTool's .classpath