Complete support for anonymous user implemented and alert's on the change of marker state added.

**Complete support for anonymous user to add the *Markers* provided** : 
- Now anonymous user can ```add``` the markers. Can also ```edit```/```delete``` the markers created by him/her in that active session only.
- The session remains active till the browser is not closed. Once browser is closed, session will be flushed/cleared.

**Implemented alert notifications for ```create``` and update (```edit```/```delete```) the *Marker***
- Custom notifications are put in the alert notifications. 
- This are depends on the action that user has performed.