Imports of custom-claims command

PathSynopsis
github.com/dgrijalva/jwt-goPackage jwt is a Go implementation of JSON Web Tokens: http://self-issued.info/docs/draft-jones-json-web-token.html
github.com/labstack/echoPackage echo implements high performance, minimalist Go web framework.
github.com/labstack/echo/engine/standard
github.com/labstack/echo/middleware
net/httpPackage http provides HTTP client and server implementations.
timePackage time provides functionality for measuring and displaying time.