WIP: upgrade solr, mahout, opennlp, etc.
replace version
progress on Lucene upgrades
Lucene stuff compiles, although not sure if it all works yet given the new Lucene APIs, especially for term vectors
Merge remote-tracking branch 'origin/version_upgrade' into drew_upgrade_wip

Conflicts:
	pom.xml
	src/main/java/com/tamingtext/classifier/bayes/BayesUpdateRequestProcessor.java
	src/main/java/com/tamingtext/classifier/bayes/ExtractTrainingData.java
	src/main/java/com/tamingtext/classifier/mlt/TrainMoreLikeThis.java
Working MoreLikeThis classifier and examples.