Warnings from URI::escape (obsolete since ruby 1.9.2) and some instance variables not initialized fixed

lib/common_helper.rb

@@ -72,6 +72,14 @@ def get_equal_string_end(stringarray = [""])
   already_found
 end
 
+# Since ruby 1.9.2, URI::escape is obsolete
+# See http://rosettacode.org/wiki/URL_encoding#Ruby and http://www.ruby-forum.com/topic/207489
+module URI
+  def self.escape(str)
+    URI.encode_www_form_component(str).gsub("+", "%20")
+  end
+end
+
 if RUBY_VERSION < "1.9"
   class Array
     # Fix for grep with symbols in ruby <= 1.8.7