added new attribute to cache entries in ldcache to indicate how many triples have been cached - this is currently used to see if the cache entry really indicates a cached resource (i.e. more than 0 triples) but can also be useful metadata in other cases
upgrade to Java 7 as dependency, because the new Jetty used for testing is built with it and we anyways have it on the agenda (MARMOTTA-124)
upgrade to Sesame 2.7.1