work to make placeholders work in Glass.Mappr.Sc.Razor simpler
fixing mvc reference in sitecore config
Check for null property objects.
Merge pull request #68 from acastr7/develop

Check for null property objects.
Fix WebActivatorEx
default values for mappers and fix to rendering parameters for Razor files in mVC
Merge branch 'develop' of github.com:mikeedwards83/Glass.Mapper into develop
Merge remote-tracking branch 'mike/develop' into develop