Generate vectors for bayes from a lucene index

 . Had to move to Lucene 4.6.1 from Lucene 4.7 to accomodate Mahout depedencies
 . Explicitly added depenency on Avro in order to satisfty Hadoop 2.2.0 added via solr
 . Re-ordered classpath in Maven pom to allow Solr Unit Test Framework to operate properly
 . Re-organized solr config/schema for bayes tests