Escaping non-ascii values (issue1693042)

[gagan . goku]

Reviewers: johnfargo, zhoresh, shindig.remailer_gmail.com,  
dev-remailer_shindig.apache.org,

Message:
Please review.
Description:
Non ascii strings encoded in utf8 cause problems in some editors like
intellij.
Escaping it non-ascii content to satisfy intellij.

Please review this at http://codereview.appspot.com/1693042/show

Affected files:
  M      
java/gadgets/src/test/java/org/apache/shindig/gadgets/rewrite/MutableContentTest.java