Added features that allow the reader to accept common non-standard JSON.
This is a version of patch #17, from Clay Wood:
http://sourceforge.net/p/jsoncpp/patches/17/
git-svn-id: http://jsoncpp.svn.sourceforge.net/svnroot/jsoncpp/trunk@280 1f120ed1-78a5-a849-adca-83f0a9e25bb6