Change the type of the exception variable to 'object'

[kpreisser]

Hi,
this PR addresses the two notes described in #90.

By changing the type of the exception variable in the catch clause from Exception to object, it is ensured that the finally block is also correctly skipped if objects are thrown that do not derive from Exception (which is possible in the CLR).

Note: When a non-Exception object is thrown and the control flow enters code generated by the C# compiler, the thrown object is wrapped in a RuntimeWrappedException so it can be caught by an catch (Exception) C# statement.
However, even with this I think it is safer to catch object in the generated IL code, to ensure JS finally blocks are not executed in such a case.

Additionally, the skipFinallyBlock variable is changed to a temporary variable.

Thanks!

[paulbartrum]

I presume it's difficult to unit test this, since you can't actually throw a non-exception-derived object in c#? Seems good to me.

[kpreisser]

Thanks! Yes, its probably difficult to test this with C#. It would be possible to test it when the MethodGenerator that generates the try-catch also generates a throw statement in the same method (within the try block) that throws a non-Exception object.