Merge pull request #1 from rseibert/master

Zoom Level Integration
Fix continent changing
Add tile loading check to avoid useless reqs
Remove unnecessary try-catch
Center and max zoom out by default
Make sure bootstrap css doesn't muck with styling
Improve sector events
Rename LayerControl to ContinentControl, since that's what it is
Add layer control for grid/sectors/labels toggling
Change attribution
Fix some labels not disappearing when hiding
Pre-Implemented Font-Awesome and added general styles for a prettier font