Bundle needed gems for BDD

* rspec
* cucumber
* capybara
* database_cleaner

features/support/selectors.rb

@@ -0,0 +1,39 @@
+module HtmlSelectorsHelpers
+  # Maps a name to a selector. Used primarily by the
+  #
+  #   When /^(.+) within (.+)$/ do |step, scope|
+  #
+  # step definitions in web_steps.rb
+  #
+  def selector_for(locator)
+    case locator
+
+    when "the page"
+      "html > body"
+
+    # Add more mappings here.
+    # Here is an example that pulls values out of the Regexp:
+    #
+    #  when /^the (notice|error|info) flash$/
+    #    ".flash.#{$1}"
+
+    # You can also return an array to use a different selector
+    # type, like:
+    #
+    #  when /the header/
+    #    [:xpath, "//header"]
+
+    # This allows you to provide a quoted selector as the scope
+    # for "within" steps as was previously the default for the
+    # web steps:
+    when /^"(.+)"$/
+      $1
+
+    else
+      raise "Can't find mapping from \"#{locator}\" to a selector.\n" +
+        "Now, go and add a mapping in #{__FILE__}"
+    end
+  end
+end
+
+World(HtmlSelectorsHelpers)