add support for tweet tracking for Twitter shares
add support for Linkedin share tracking
add trackable click events for Linkedin and Twitter
Remove unused dirs
Rename facebook-loader to facebook-api-client
Added limited click tracking for facebook-share
Include component-name in facebook-share click tracking to allow developers to distinguish from clicks on other facebook components.
Document `tracking` property of the social api client classes.
Merge branch 'master' into tracking
Provide example and documentation of tracking object.
Add TODO for tracking tasks on facebook-like and facebook-facepile
Add contributors section