already listed in instaweb.gyp:instaweb_system, and resource_tag_scanner.cc is
also in instaweb_rewriter.
(Having the dupes is a problem when one tries to link things together properly).
* pulls ApacheFetch out into it's own file
* creates a set of mock apache functions that log to a global varible
* extends NullCondvarCapableMutex to support condvars
* comments on, but does not fix, bug in cookie stripping