Monkeypatch Cucumber for Ruby 2.2.0 compat

https://github.com/cucumber/cucumber/pull/774

features/support/env.rb

@@ -2,6 +2,16 @@ require 'aruba/cucumber'
 require 'fileutils'
 require 'forwardable'
 
+# Ruby 2.2.0 compat
+Cucumber::Ast::Step.class_eval do
+  undef_method :text_length
+  def text_length(name=name())
+    self.class::INDENT + self.class::INDENT +
+      keyword.unpack('U*').length +
+      name.unpack('U*').length
+  end
+end
+
 system_git = `which git 2>/dev/null`.chomp
 lib_dir = File.expand_path('../../../lib', __FILE__)
 bin_dir = File.expand_path('../fakebin', __FILE__)