Merge pull request #66 from zielmicha/master

Check for exception after calling constructor
dont overload the type, or later if will failed as well.
fix NotImplemented not found
Merge pull request #69 from smglab/master

fix NotImplemented not found
make sure that GetObjectArrayElement are freed.
Merge branch 'master' of github.com:kivy/pyjnius
proxy: add "except *" to correctly propagate the python exception in invoke0, and let traceback print it. (python exception doesn't go through java... ^^).
+ avoid double-referencing in proxy. Before, we was having weird issue without it, but i'm not able to trigger it right now. Do the clean way.
fixes for convert_jobject_to_python to correctly handle [B as parameters, as well as "Ljava/lang/Object;" that can be converted into "[Ljava/lang/String;"
new ByteArray native class, used to transport [B in python, instead of using Python list + integer.
ByteArray have .tostring() + .tolist(), and support slices / item lookup / size, but everything is readonly.
Fix field dereference when multiple instances of a class exist. Fixes #77