app icon replce to 'book30' from FlatIcon. attribution (to be added to credits dialog when I have it) <div>Icons made by <a href="http://www.freepik.com" title="Freepik">Freepik</a> from <a href="http://www.flaticon.com" title="Flaticon">www.flaticon.com</a>         is licensed by <a href="http://creativecommons.org/licenses/by/3.0/" title="Creative Commons BY 3.0">CC BY 3.0</a></div>
new full-size icon for PlayStore + README.md change
.iml's are to be commited per IntelliJ Docs
change old 'Be careful..' message to something at least a little more appropriate
new app's icon & work files