Added git ignore file to ignore livecache and templates_c directories.
Added usingConservativeCaching flag to the livecache that causes SWeTE to only cache content that is marked as public.  This is *much* safer than the previous optimistic caching approach whereby any content not explicitly declared private would be cached by SWeTE.  Also added better support for Etags so that, if the server uses Etags properly it will still have good performance.
https://github.com/shannah/swete/issues/4
usingConservativeCaching is now the default behaviour.