Renamed configurations to frameworks in project.json
Adding support for activating view properties
Fixes #700
Revert "Adding support for activating view properties"

This reverts commit 21bb8cb9fb86bb03ba848c4b4e99a1945c26dcbc.
Reacting to System.Collections version change
Reacting to System.Collections versioning change
Cache file info access in viewengine

Move compilation and VirtualPathViewFactory to be singletons
And cache access to files.

The cache time is controlled by MVC options.

The cache is implemented in the ExpiringFileInfoCache.cs
Add test and start adding docs
More tests