Maybe this?

Gemfile

@@ -1,9 +1,10 @@
 source :gemcutter
 
-gem 'rake'
-
 gemspec
 
+gem 'rake'
+gem 'capybara', "~> 1.0.0"
+
 group :test do
   gem 'cucumber'
   gem 'rspec', '~> 2.12'

gemfiles/capybara-1.x.gemfile

@@ -1,9 +1,8 @@
 source :gemcutter
 
-gem 'rake'
-
 gemspec
 
+gem 'rake'
 gem 'capybara', '~> 1.0.0'
 
 group :test do

gemfiles/standard.gemfile

@@ -1,9 +1,10 @@
 source :gemcutter
 
-gem 'rake'
-
 gemspec
 
+gem 'rake'
+gem 'capybara', '~> 2.0.0'
+
 group :test do
   gem 'cucumber'
   gem 'rspec', '~> 2.12'

sauce.gemspec

@@ -18,7 +18,6 @@ Gem::Specification.new do |s|
   s.test_files = Dir['spec/**/*.rb']
 
   s.add_dependency('net-http-persistent')
-  s.add_dependency('capybara', '>= 1')
   s.add_dependency('rest-client', [">= 0"])
   s.add_dependency('net-ssh', [">= 0"])
   s.add_dependency('net-ssh-gateway', [">= 0"])

travis.yml

@@ -1,4 +1,5 @@
 script: "bundle exec rake"
+
 rvm:
   - 1.9.3
 gemfile: