Prepend theme templates to lookup paths
Prepend theme templates to lookup paths

Currently theme templates are appended to the lookup paths, making
it impossible for theme templates to totally override default
templates. Prepend the paths to theme templates instead.

caesar2164/edx-platform,jbassen/edx-platform,jbassen/edx-platform,Stanford-Online/edx-platform,caesar2164/edx-platform,Stanford-Online/edx-platform,jbassen/edx-platform,caesar2164/edx-platform,caesar2164/edx-platform,jbassen/edx-platform,Stanford-Online/edx-platform,jbassen/edx-platform,Stanford-Online/edx-platform