renaming toy-epengine.xml back to toy-sundar.xml!

-> following comments from Phil and Wayne

Change-Id: If0e81fee008ae639980cb3c6f159c2c423dfe403
Reviewed-on: http://review.couchbase.org/29012
Reviewed-by: Sundararaman Sridharan <sundar.sridharan@gmail.com>
Tested-by: Sundararaman Sridharan <sundar.sridharan@gmail.com>