btree: remove dependency on github.com/satori/go.uuid #192
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The only call was uuid.NewV4().Bytes(), which really means
"get me 16 random bytes".
uuid.NewV4 changed at some point to return an error in addition
to the UUID, which made this code no longer compile.
There's no need to depend on a uuid package to get 16 random bytes.
Do what the old package did, namely read from crypto/rand.Reader
and expect it to succeed (or else panic), but without the dependency.
Fixes #187.
Fixes #188.