Add support for Array.forEach if not support (as in some I.E versions)
Update README.mkdn

Added goal for this fork
Added nodeSelected parameter, I think.
Using nodeSelected parameter.
Removed not yet implemented at the bottom of readme
Merge pull request #14 from zcourts/master

add support for Array.foreach if not supported
Merge remote branch 'lowerkey/master'

* lowerkey/master:
  Removed not yet implemented at the bottom of readme
  Using nodeSelected parameter.
  Added nodeSelected parameter, I think.
  Update README.mkdn
Only call nodeSelected callback if it has been defined
Tidied up comments from code review
Removed animation interval parameter
Removed edge label from demo
Moved forEach implementation to bottom of file
Fixed Raphael demo
Update README.mkdn
Update README.mkdn
Demystify 'undefined' to make code more readable
Add helper method .addNodes() that accepts list of strings.