Revert "Revert "update the install script with ref to master""

This reverts commit 7358178b7d491967e284d6bf24a7a125aa2c0d0b.
Revert "update the gxp.js with some new layers"

This reverts commit b10ab5b8315db319ed8caa127fd2cb0b96929135.
Revert "update the plugin with some more layers and identify the server that we are connecting to with a comment"

This reverts commit df3a57e6bedb3220cc7efab2a95b60c7ce29533e.