Add Spring View support for Groovy Markup Templates

This commit adds support for Groovy Markup templates.
Spring's support requires Groovy 2.3.1+.

To use it, simply create a GroovyMarkupConfigurer and a
GroovyMarkupViewResolver beans in the web application context.

Issue: SPR-11789
Add resolveTemplate method to Groovy markup configurer
Fix failing test