Finish select2-ajax for users. Added Select2Helper for tests

spec/support/select2_helper.rb

@@ -0,0 +1,25 @@
+# Select2 ajax programatic helper
+# It allows you to select value from select2
+#
+# Params
+#   value - real value of selected item
+#   opts - options containing css selector
+#
+# Usage:
+#
+#   select2(2, from: '#user_ids')
+#
+
+module Select2Helper
+  def select2(value, options={})
+    raise "Must pass a hash containing 'from'" if not options.is_a?(Hash) or not options.has_key?(:from)
+
+    selector = options[:from]
+
+    if options[:multiple]
+      page.execute_script("$('#{selector}').select2('val', ['#{value}']);")
+    else
+      page.execute_script("$('#{selector}').select2('val', '#{value}');")
+    end
+  end
+end