OPENNLP-658 Added an interface for the sequence coding. And implementations for IOB2 and BILOU coding 

git-svn-id: https://svn.apache.org/repos/asf/opennlp/trunk@1572990 13f79535-47bb-0310-9956-ffa450edef68
OPENNLP-658 Added an interface for the sequence coding. And implementations for IOB2 and BILOU coding 

git-svn-id: https://svn.apache.org/repos/asf/opennlp/trunk@1572991 13f79535-47bb-0310-9956-ffa450edef68