Cache: added ngx_quit check to ngx_http_file_cache_expire(). While managing big caches it is possible that expiring old cache items in ngx_http_file_cache_expire() will take a while. Added a check for ngx_quit / ngx_terminate to make sure cache manager can be terminated while in ngx_http_file_cache_expire().

make -f misc/GNUmakefile release

the required tools:
*) xsltproc to build CHANGES,
*) xslscript.pl ( http://hg.nginx.org/xslscript ) to build XSLTs
   from XSLScript sources.


make -f misc/GNUmakefile icons

the required tool:
*) netpbm to create Win32 icons from xpm sources.