Merge pull request goodwill#1 from chanthou/master

update select2_multiple to find by xpath

gem/lib/capybara-select2.rb

@@ -58,10 +58,14 @@ def select2_ajax(value, options = {})
     end
 
     def select2_multiple(value, options = {})
-      raise "Must pass a hash containing 'from'" if not options.is_a?(Hash) or not options.has_key?(:from)
-      select_name = options[:from]
+      raise "Must pass a hash containing 'from' or 'xpath'" unless options.is_a?(Hash) and [:from, :xpath].any? { |k| options.has_key? k }
 
-      select2_container=first("label", text: select_name).find(:xpath, '..').find(".select2-container")
+      if options.has_key? :xpath
+        select2_container = first(:xpath, options[:xpath])
+      else
+        select_name = options[:from]
+        select2_container = first("label", text: select_name).find(:xpath, '..').find(".select2-container")
+      end
 
       [value].flatten.each do |value|
         select2_container.find(:xpath, "a[contains(concat(' ',normalize-space(@class),' '),' select2-choice ')] | ul[contains(concat(' ',normalize-space(@class),' '),' select2-choices ')]").click