fix(server): complete acknowledgment
fix(reporter): sourcemap not working in windows

resolve #1200
fix(cli): override if an arg is defined multiple times

```bash
karma start --log-level info --port 12 --log-level debug --port 34
```
Is now parsed as:
```js
{
  logLevel: 'DEBUG',
  port: 34
}
```

Closes #1192
chore: release v0.12.26
Merge pull request #1248 from bem/fix.crash

fix(browser): don't add already active socket again on reconnect
Merge branch 'pr-1201' into presubmit-master-pr-1201
chore: release v0.12.27
Merge branch 'pr-1171' into presubmit-master-pr-1171
chore: release v0.12.28
feat(reporter): cache SourceMapConsumer

Error formatting is very slow on big files. This makes it a lot faster.
Merge branch 'pr-1232' into presubmit-canary-pr-1232