Need to Add external website link in notification

Need to Add external website link in notification

References

Reference NO 1

http://forums.adobe.com/thread/870813

Reference NO 2

http://www.boogiejack.com/external_links.html

Reference NO 3

https://support.google.com/drive/answer/2494822?hl=en

Reference NO 4

http://en.wikipedia.org/wiki/Trackback

Reference NO 5

http://webaim.org/techniques/hypertext/hypertext_links

Reference NO 6

http://stackoverflow.com/questions/13556990/warning-when-clicking-external-links-and-how-to-add-it-to-a-link-class

Reference NO 7

https://help.yammer.com/entries/20639942-Notes

Reference NO 8

http://betterwp.net/community/topic/68/code-suggestions-for-redirect-to-external-site/