clean up dependencies

[iqualfragile]

as stated earlier, networking should be optional, so hyper and all its dependencies can be made an optional feature
maplit is largely useless, as you can just do vec![(a,b),(c,d),...].into_iter().collect() and get a hashmap.
rust_crypto is a) not secure to use according to the authors, and b) not even used.

[spacejam]

I've removed maplit and rust_crypto, I'll think about a nicer way of optionally including hyper. Hyper is pretty overkill for the usage, and I like your suggestion of GeoClue!
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