Re: Move all HTMLContentRewriter and *LinkRewriter to a separate package. (issue248042)

[zhoresh]

LGTM

I am not sure how by part of the attached patch is no complete. For
example for:
java/gadgets/src/main/java/org/apache/shindig/gadgets/rewrite/old/CssRequestRewriter.java

http://codereview.appspot.com/248042/show