SLING-913 - Add a cache for pre-compiled scripts * implemented a size-bound event-based ScriptCache that can store compilation results for ScriptEngines that implement Compilable * provided a Felix web console plugin for the ScriptCache implementation so that cache entries can be manually removed from the cache, if needed * updated JavaDoc to comply with Java 1.8 git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1690904 13f79535-47bb-0310-9956-ffa450edef68