uber-go / zap / 1549

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Skip runtime and some zap frames in stacktraces (#311)

Remove `runtime.goexit`, `runtime.main`, and some zap frames from our stacktraces. Since we're now formatting our own traces, we also get a *big* performance win: nearly 5x faster and half the number of bytes allocated!

Current master:

```
BenchmarkStackField-4             200000              9587 ns/op             960 B/op          2 allocs/op
```

After this PR:

```
BenchmarkStackField-4             500000              2149 ns/op             448 B/op          2 allocs/op
```

Fixes #308.

44 of 44 new or added lines in 2 files covered. (100.0%)

2128 of 2191 relevant lines covered (97.12%)

209782.94 hits per line