ACCUMULO-1382 Make PairLexicoder use a ComparablePair, so the Comparable-ness of its parameters can be enforced. Also fixed javadocs, header comments, formatting, and warnings introduced by ACCUMULO-1336.


git-svn-id: https://svn.apache.org/repos/asf/accumulo/trunk@1479448 13f79535-47bb-0310-9956-ffa450edef68