Minor cleanup

Gemfile

@@ -2,5 +2,5 @@ source 'https://rubygems.org'
 gemspec
 
 gem 'coveralls', require: false
-gem 'celluloid',    github: 'celluloid/celluloid'
-gem 'celluloid-io', github: 'celluloid/celluloid-io'
+gem 'celluloid'
+gem 'celluloid-io'

lib/celluloid/redis.rb

@@ -1,4 +1,4 @@
 require "redis"
 
 require "celluloid/redis/version"
-require "celluloid/redis/redis_ext"
+require "redis/connection/celluloid"

spec/redis/connection/celluloid_spec.rb

@@ -9,10 +9,10 @@
 
     # FIXME: perhaps some better tests are in order here?
     redis.set(example_key, '')
-    redis.get(example_key).should eq ''
+    expect(redis.get(example_key)).to eq('')
 
     redis.set(example_key, example_value)
-    redis.get(example_key).should eq example_value
+    expect(redis.get(example_key)).to eq(example_value)
   end
 
   it "cleanly shuts down an instance" do