update ODataLib to 5.6.0-rc1
Fix some flaky OData JSON tests using string comparison

Fixing by using JToken.EqualityComparer.
Issue 1075: Web API: Improve resolution of ApiController types.

GetExportedTypes() has a different behavior as compared to GetTypes().
GetExportedTypes() throws a FileNotFoundException if it is unable to load
dependent assemblies where as GetTypes() throws
ReflectionTypeLoadException containing loaded types.