Removed unused popen4 dependency

Gemfile

 source "http://rubygems.org"
 
-gem "open4"
 gem "colored"
 gem "escape"
 gem "json"

Gemfile.lock

@@ -38,7 +38,6 @@ GEM
       faraday_middleware (~> 0.8)
       hashie (~> 1.2)
       multi_json (~> 1.0)
-    open4 (1.3.0)
     pry (0.9.8.4)
       coderay (~> 1.0.5)
       method_source (~> 0.7.1)
@@ -64,7 +63,6 @@ DEPENDENCIES
   kicker
   mocha-on-bacon
   octokit
-  open4
   pry
   rake
   rb-fsevent

cocoapods.gemspec

@@ -29,7 +29,6 @@ Gem::Specification.new do |s|
                            "you are upgrading, first run: $ pod setup"
 
   s.add_runtime_dependency 'xcodeproj', '~> 0.1.0'
-  s.add_runtime_dependency 'popen4', '~> 0.1.2'
   s.add_runtime_dependency 'colored', '~> 1.2'
   s.add_runtime_dependency 'escape', '~> 0.0.4'
   s.add_development_dependency 'bacon', '~> 1.1'