Rewrote slog searching stuff

- Dealing using go-slog to try and see into the xPost issue brought to light some issues with the search
        - Namely the search could only search a single column
- This fixes that issue which required some mild refactoring of the table class.

This means you can now do searches like this:
![](http://cl.ly/image/3e3C0h3G2g3M/Image%202014-11-19%20at%206.07.21%20PM.png)

Issue: 
https://github.com/GigaOM/gigaom/issues/5894