Imports of package v2

PathSynopsis
fmtPackage fmt implements formatted I/O with functions analogous to C's printf and scanf.
github.com/docker/distribution/digest
github.com/gorilla/muxPackage mux implements a request router and dispatcher.
net/httpPackage http provides HTTP client and server implementations.
net/urlPackage url parses URLs and implements query escaping.
regexpPackage regexp implements regular expression search.
stringsPackage strings implements simple functions to manipulate UTF-8 encoded strings.