made a minor change to _zoomOrSpiderfy to Spiderfy without zooming if everything in the cluster is at the same lat long. This prevents zooming into max level if there is no real reason to do so, since all points will be at the same location. This minor change increased usability in a personal project.
fixed whitespace issues
fixed a newly created whitespace issue
updated readme to reflect new difference in behavior for spiderfyOnMaxZoom option
changed a small formatting issue to include italic in the entire note
Merge pull request #415 from rdenniston/master

made a minor change to _zoomOrSpiderfy to Spiderfy without zooming