more static methods for Integer + Float

[gavinking]

I have added smallest(), largest(), min(), max(), and product() to Integer and Float, along with Java implementations.

@chochos for some reason the Ceylon implementation of these static methods gets ignored by the JS compiler, so I need you to add implementations for JS.

[chochos]

Integer.ceylon and Float.ceylon are not compiled because they're a mess due to interop so it's still all native

[gavinking]

Thanks!

[gavinking]

Wait, @chochos, it doesn't look like Float.min(), Float.max(), Float.smallest(), Float.largest() are handling NaN or -0.0 correctly.

[gavinking]

I tried to fix this, but I give up. Something very screwy here with -0.0.

[gavinking]

OK I fixed it. So JavaScript's valueOf() method doesn't correctly handle -0?

[chochos]

Seems it doesn't. That's why I didn't optimize division and left it as a call to quotient or whatever.