Fix rnn methods

[cbovar]

Hi, a few methods related to RNN didn't seem to have the right parameters.

The calls to those methods now succeed with those modifications (although I still don't know how to properly use cudn rnn methods see my questions to nvidia here)

[kunzmi]

Thanks for contributing! Sorry for the late comment, I was travelling through California and I'm at GTC right now... I'll have a look at it once I'm back home.

[AeroClassics]

Thanks for contributing! Sorry for the late comment, I was travelling through California and I'm at GTC right now... I'll have a look at it once I'm back home.

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[kunzmi]

I went through your PR and it actually doesn't really fix the problem: In combination with pinvoke the use of "out" instead of "ref" is not recommended as the compiler can't check that the value is actually set. If the library, for what ever reason, does not set the value correctly the variable remains without defined value. This should never happen in managed world...
As for the wrong arguments: I fixed that now, at the same time I upgraded to cudnn v6.
In the RNN section are some argument types where I'm not 100% sure if they are correctly ported to C#. Some of your interpretations are wrong, again I'm not sure if I did it right.
Please check and don't hesitate to reopen the issue.

Cheers,
Michael