Unify StringTransformer and RewriteRule #54
Description
Wayback has two distinct interfaces for rewriting text resources: StringTransformer and RewriteRule. It'll be useful if we can somehow unify these. At least there's a need for using MultipleRegexReplaceStringTransformer as RewriteRule. First step is to have MultiRegexReplaceStringTransformer implement RewriteRule interface.
Changes are on unify-rewrite branch, and ready to merge into openwayback.