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
IUrlHelper and IViewComponentHelper need to be activated

* Removing Init method and using [Activate] to activate IUrlHelper.
* Moving IViewComponentHelper to default injected properties
* Adding functional tests to verify these properties are injected \
  activated

Fixes #789
Fix for issue #610 - Ignore internal and nested types

This change exludes internal and nested types from being treated as
controllers. This is consistent with MVC5's behavior.

DefaultActionSelectionConventions was primarily tested through running
action selection. I wanted to also test the methods with substantial logic
in this class, so I moved a spate of a classes from private classes inside of the
integration tests to public classes so they could be shared. I also added
tests to fill gaps in DefaultActionSelectionConventions, which is the vast
vast majority of this change.
Reacting to System.Security.Cryptograph.Encryption package rename
Filter tests
try to trigger a private run