satori / go.uuid / 154

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Return enthropy errors from UUID generation.

This commit changes signature for `NewV1`, `NewV2` and `NewV4` functions
which from now will return `(UUID, error)` instead of `UUID`.
To emulate old behavior of panicking on enthropy errors one can wrap
a call into `Must` helper similar to:
```
u := uuid.Must(uuid.NewV4())
```

Closes #18.

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