Updates to SPARQL client to allow parsing with other tools, if so wished.

sparql-client-refactor.rb

require 'sparql/client'
require 'rest_client'

sparql = SPARQL::Client.new("http://dbpedia.org/sparql")

# existing functionality:
p sparql.query("select distinct ?Concept where {[] a ?Concept}").inspect

# now equivalent to:
response = RestClient.post 'http://dbpedia.org/sparql', { :query => "select distinct ?Concept where {[] a ?Concept}" }, :content_type => 'application/x-www-form-urlencoded', :accept => 'application/sparql-results+json'
p SPARQL::Client.parse_json_bindings(response)

# also now equivalent to:
response = sparql.response("select distinct ?Concept where {[] a ?Concept}", SPARQL::Client::ACCEPT_JSON )
puts responset.body
p SPARQL::Client.parse_json_bindings(response.body)