Use github.com/google/uuid instead of github.com/satori/go.uuid

[lithammer]

Given the recent issues with github.com/satori/go.uuid (satori/go.uuid#66), which are still partly unresolved, e.g. its master isn't compatible with us (see #7, #8, #9, 10, #11 and #12).

Even though github.com/google/uuid is only at v0.1 and clearly states this:

This package is currently in development and the API may not be stable.

The API will become stable with v1.

I suspect it's a better longterm investment. And speed wise they seem pretty identical:

google/uuid

BenchmarkUUID-4       	  200000	   7967 ns/op	    5768 B/op	   157 allocs/op
BenchmarkEncoding-4   	  200000	   6635 ns/op	    5776 B/op	   157 allocs/op
BenchmarkDecoding-4   	 1000000	   2126 ns/op	    1228 B/op	    38 allocs/op

satori/go.uuid

BenchmarkUUID-4       	  200000	   8188 ns/op	    5768 B/op	   157 allocs/op
BenchmarkEncoding-4   	  200000	   6726 ns/op	    5776 B/op	   157 allocs/op
BenchmarkDecoding-4   	 1000000	   2156 ns/op	    1228 B/op	    38 allocs/op

[lithammer]

@dcarbone @semafor @zanjs you might be interested in this.

[zanjs]

@Renstrom Nice!

[dcarbone]

This would be a nice move, i think :)