Updated files to the Sitecore 7.2 package

Also updated Web.Config to match Sitecore's 7.2 Web.Config.
Updated MVC files to Sitecore 7.2 package

Also updated Web.Config to Sitecore 7.2 Web.Config
Updated MVC project references for MVC 5

Matches the LaunchSitecore package. Also removed unused WebMatrix
references.
Updated Sitecore 7.2 config files for IntelliSense
Updated MVC items to Sitecore 7.2. items
Updated Glass Mvc package to MVC 5
Updated WebForms items to Sitecore 7.2 package
Updated SC7.2 config files for IntelliSense

Added to the WebForms project.
Updated README with tag notes on 7.2 version
Merge branch 'feature-Sitecore-MVC-72-upgrade' into develop