Add documentation for opt-in parameter
Added test for HTML5_APPCACHE_EXCLUDE_URL, HTML5_APPCACHE_NETWORK_URL, HTML5_APPCACHE_FALLBACK_URL
Fix support for HTML5_APPCACHE_NETWORK_URL, HTML5_APPCACHE_FALLBACK_URL. Add HTML5_APPCACHE_EXCLUDE_URL
Add documentation for HTML5_APPCACHE_EXCLUDE_URL