Turn off doclint so project javadocs can be built in Java8

Turn off doclint so project javadocs can be built in Java8, see http://blog.joda.org/2014/02/turning-off-doclint-in-jdk-8-javadoc.html
Merge pull request #216 from ceefour/patch-1

Turn off doclint so project javadocs can be built in Java8