Filters assembly references appropriately
- Filter assemblies references from nuget packages if defined
  in the nuspec. This is the logic nuget uses when adding references
  to the project in the VS client.
Preserve relative path to embedded resources.
Updated sample to get new resource path
Adding caching to kpm restore

use -r or --refresh argument to force refresh of cached data
during a restore
Using the same HttpClient for all requests to a source
Fix local caching for kpm

- Add "--no-cache" flag to control use of local cache
- Add feed pagination handler and cache all pages