doc for building the project | script for cache warming module | license file | assembly descriptor for building a container with all libs necessary for Solr

cleaned some javadoc warnings | added debuglog member flags to enable debug info output | added pentaho repository entry inside pom.xml

new parameter to prune document cont for cluster summarization | LRUCache in RelevantTermsSummarizer

better performance of distributed ClusteringComponentSummarizer | fixed Solr log warning message in LastQueriesWarmer