Merge pull request #397 from Elzair/master

Added support for specifying additional marker options
Update directory name,markers-clustering-example

Update resource directory name. Edit directory name "/bower_components/leaflet.markerclusterer/" to "/bower_components/leaflet.markercluster/"
Merge pull request #399 from trpansh/patch-1

Update directory name, markers-clustering-example
Fixed setting geoJSON on multiple maps in DOM
Updating icon init: if user specifies iconUrl, we must not use DefaultIcon, bacause shadowUrl won't be managed properly (if shadowUrl is not specified, leaflet will try to load default shadow image)
Merge pull request #411 from Natsu-/shadow_icon_issue

Updating icon init to obtain custom icon without shadow
Merge pull request #407 from voortwis/master

Fixed setting geoJSON on multiple maps in DOM
Made angular-leaflet-directive compatible with Browserify and Webpack by adding a "main" parameter to package.json