Revert "Adding support for activating view properties"

This reverts commit 21bb8cb9fb86bb03ba848c4b4e99a1945c26dcbc.
Reacting to System.Collections version change
Reacting to System.Collections versioning change
Adding support for activating view properties
Fixes #700
Http Abstractions for parsing Http headers needed for conneg
Adding OutputFormatter base class
Responding to comments, adding summary headers.
Responding to comments and changing the interface to take in a formatter context.
fixing test
Adding MvcOptions.OutputFormatters property.
Moving to OutputFormatterDescriptor