ACCUMULO-992 - new security documentation, plus fixed some double space and capitilzation issues




git-svn-id: https://svn.apache.org/repos/asf/accumulo/trunk@1482148 13f79535-47bb-0310-9956-ffa450edef68
 ACCUMULO-992 - Forgot to save a file before committing




git-svn-id: https://svn.apache.org/repos/asf/accumulo/trunk@1482154 13f79535-47bb-0310-9956-ffa450edef68
ACCUMULO-992 reverting r1482154, r1482153, r1482148, r1482141 due to corrupt image file (failure_handling.png) that prevents LaTeX from building

git-svn-id: https://svn.apache.org/repos/asf/accumulo/trunk@1482171 13f79535-47bb-0310-9956-ffa450edef68