added a gemfile

Gemfile

@@ -0,0 +1,4 @@
+source 'https://rubygems.org'
+
+# Specify your gem's dependencies in riot_api.gemspec
+gemspec

sightstone.gemspec

@@ -10,5 +10,4 @@ Gem::Specification.new do |s|
   s.homepage = 'https://github.com/danijoo/Sightstone'
   s.license = 'MIT'
   s.add_runtime_dependency 'rest-client'
-#  s.add_runtime_dependency 'json'
 end