FEATURE: backport a minimal String#scrub

BUGFIX: invalid byte sequence in email would explode all processing

lib/freedom_patches/scrub.rb

@@ -0,0 +1,16 @@
+class String
+  # A poor man's scrub, Ruby 2.1 has a much better implementation, but this will do
+  unless method_defined? :scrub
+    def scrub
+      str = dup.force_encoding("utf-8")
+
+      unless str.valid_encoding?
+        # work around bust string with a double conversion
+        str.encode!("utf-16","utf-8",:invalid => :replace)
+        str.encode!("utf-8","utf-16")
+      end
+
+      str
+    end
+  end
+end