hypermap binding cacher

[nick1udwig]

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[nick1udwig]

bindings.rs is largely copied from hypermap.rs

I'm wondering if we can't remove all the dupe'd code and bring whatever unique functionality in from bindings.rs to hypermap.rs

E.g., we obviously need some constants: bring those in.

It looks like we need the ability to hit binding-cacher rather than hypermap-cacher: seems like we can just factor out a more general version of this function that takes an argument of what processid to hit, and then define a hypermap and a binding version that wraps that function, passing in the appropriate processid