Documentation

task #36: Add support for java 8 
http://github.com/jpschewe/fll-sw/issues/issue/36
Need an absolute path for ServletContext.getRealPath()

We were passing "sponsor_logos", but need to pass "/sponsor_logos"
otherwise the method doesn't know where to start looking.

task #36: Add support for java 8 
http://github.com/jpschewe/fll-sw/issues/issue/36