Work some more on the website

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/csv/trunk@1609771 13f79535-47bb-0310-9956-ffa450edef68
Add new user guide (missed that in the last commit)

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/csv/trunk@1609772 13f79535-47bb-0310-9956-ffa450edef68
Define RAT exclusions for test data

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/csv/trunk@1609776 13f79535-47bb-0310-9956-ffa450edef68
Fix typo

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/csv/trunk@1609777 13f79535-47bb-0310-9956-ffa450edef68