LANG-1008: Change min/max methods in NumberUtils/IEEE754rUtils from array input parameters to varargs. This also closes #23 from github. Thanks to Thiago Andrade.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/lang/trunk@1593118 13f79535-47bb-0310-9956-ffa450edef68