Issue #17, Issue #18, Issue #19.

- Removed MM/DD date format. Troublesome to work with, not very helpful either.
- Chat lines are now grouped into one-minute intervals.
- Minor UI fixes.
Cleaned up the message retreiver a little bit.
Added context-based search.
Merge pull request #33 from jovan-s/master

Issue #17, Issue #18, Issue #19, Issue #21.