[time] Doesn't support look ups based on standard time zones

**SEVERITY LEVEL**: CRITICAL, BLOCKER

Expected output:

```
[17:14] <@user> .t utc-11
[17:14] <@bbm> Sun Oct 11 10:14:21 2015 UTC-11
```

Actual output:

```
[17:14] <@user> .t utc-11
[17:14] <@bbm> Sun Oct 11 15:14:21 2015 - Universidad Tecnologíca Coatarricense, Guapiles, Costa Rica (America/Costa_Rica-Central Standard Time)
```
