Adding clear functionality to logs

- Clear button in right side of filter bar will clear currently
selected data (if on all namespace, all filters, it will clear all
data, otherwise it will delete only data matching the selected
namespace(s) and filter(s).
- Renamed output file to fn.logger.min.js
- Added unit tests for clear method

Fixes #2
removed debug global
Merge pull request #9 from joshschumacher/master

Adding clear functionality to logs