Add div for the setting in toolbar.html
Implement dynamic backlog amount
Make settings more descriptive using tooltips
Fix UI bug where settings were not aligned correctly
Truncate list of lines for each tab

Keep amount of lines equal to backlog amount + 5% to prevent a memory leak.
Add default backlog amount of 250
Fix query service tests

Tests for query.addLine and query.clear were failing as $rootScope.settings was undefined.
Merge pull request #59 from coldstorm/setting/backlog

Add setting for changing amount of backlog lines