Faraday is now used in place of RestClient. Faraday provides an
abstraction over ruby HTTP libraries allowing them to be swapped out
easily. This change was motivated by Stardog not treating headers as
case insensitive and the need to use a backend that does not normalize
headers to work around this. The built-in ruby net/http library is used
by default but it is recommended that an alternate backend for Faraday
be used (excon or typhoeus) if possible.