Update current_issues.md

Removed resolved items, added unresolved items.

- <http://efforg.github.io/congress-forms-test/index.html?bioguide_id=M000312> - [Issue thread, resolved, invalid zip related](https://github.com/unitedstates/contact-congress/issues/267#issuecomment-40734486)

[Issue thread - seems to be related to timeout issue, now all success](https://github.com/unitedstates/contact-congress/issues/30)