Add DataValues as requirement in composer.json

Change-Id: I72c129c3a63369862c98837f42c818cd3536fd5b
Added Travis CI build status image to readme.md

Change-Id: I665a0d04094b2b5a771f16a314a46d98b1c12c38
Throw an exception when DataValues is not loaded rather then outputting HTML

Change-Id: I6f492875d5ad5834247f3797a8e95afc5f798525
Merge "Added Travis CI build status image to readme.md"
Merge "Add DataValues as requirement in composer.json"