Add hyperbolic ops

[FayazRahman]

• Adds hyperbolic ops to ops/numpy
• Closes hyperbolic functions missing #612

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[fchollet]

Thanks for the contribution! Looking good 👍

[fchollet]

Please check out the test failures -- to format the code you can use sh shell/format.sh

[FayazRahman]

Pushed fixes. Just noticed there is a tanh in ops.nn as well, I'm wondering if something needs to be done about that.

[fchollet]

Just noticed there is a tanh in ops.nn as well, I'm wondering if something needs to be done about that.

Typically it will be accessed from ops. I think we should remove the one from ops.nn and keep the numpy one.

[fchollet]

Thank you! 👍

[fchollet]

Still seems to be some test failures.

[FayazRahman]

Those tests are passing for me on all backends though.