Add Contribs page & various cleanup

* Create CONTRIBUTIONS.md
        * Track contributions and dependency licenses in order to
                satisfy Kuali ECLv2 licensing requirements.
* Update version information, v3.14.1
        * Update Changelog & Version number
* Update configuration defaults
        * Framework points at Test Environment by default now.
* Update Page spec behavior
        * Page spec now expects IFrame class instead of Frame for
                iframeportlet recognition test.