Move development dependencies into the gemspec

Gemfile

@@ -1,6 +1,2 @@
 source "http://rubygems.org"
-gem "rspec", '~> 2.6.0', :require => false
-gem "capybara"
-gem "sinatra", :require => false
-gem "mini_magick", :require => false
-gem 'rake'
+gemspec

Gemfile.lock

@@ -1,3 +1,9 @@
+PATH
+  remote: .
+  specs:
+    capybara-webkit (0.6.1)
+      capybara (< 1.2, >= 1.0.0)
+
 GEM
   remote: http://rubygems.org/
   specs:
@@ -47,7 +53,7 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
-  capybara
+  capybara-webkit!
   mini_magick
   rake
   rspec (~> 2.6.0)

capybara-webkit.gemspec

@@ -13,7 +13,11 @@ Gem::Specification.new do |s|
   s.require_path = "lib"
   s.rubygems_version = "1.3.5"
   s.summary = "Headless Webkit driver for Capybara"
-  s.add_runtime_dependency "capybara", "~> 1.0.0"
+  s.add_runtime_dependency "capybara", [">= 1.0.0", "< 1.2"]
+  s.add_development_dependency "rspec", "~> 2.6.0"
+  s.add_development_dependency "sinatra"
+  s.add_development_dependency "mini_magick"
+  s.add_development_dependency "rake"
   s.extensions = "extconf.rb"
 end