Switch to local xpath via environment variable

Gemfile

@@ -1,4 +1,5 @@
 source :rubygems
 
 gem 'bundler', '~> 1.0'
+gem 'xpath', :path => '../xpath' if ENV['XPATH_LOCAL']
 gemspec

Gemfile.lock

@@ -82,6 +82,3 @@ DEPENDENCIES
   sinatra (>= 0.9.4)
   xpath (~> 0.1.2)
   yard (>= 0.5.8)
-
-METADATA
-  version: 1.0.6

capybara.gemspec

@@ -29,7 +29,7 @@ Gem::Specification.new do |s|
   s.add_runtime_dependency("selenium-webdriver", [">= 0.0.27"])
   s.add_runtime_dependency("rack", [">= 1.0.0"])
   s.add_runtime_dependency("rack-test", [">= 0.5.4"])
-  s.add_runtime_dependency("xpath", ["~> 0.1.2"])
+  s.add_runtime_dependency("xpath", ["~> 0.1.2"]) unless ENV['XPATH_LOCAL']
 
   s.add_development_dependency("sinatra", [">= 0.9.4"])
   s.add_development_dependency("rspec", [">= 2.0.0"])