* update polo to version 0.7.1

Signed-off-by: Martin Schaaf <martin@mascha.me>
* disable menu creation on non macos platforms because copy/paste/cut shortcuts work there without it

Signed-off-by: Martin Schaaf <martin@mascha.me>
* add icudtl.dat file for linux current node-webkit on dist creation

Signed-off-by: Martin Schaaf <martin@mascha.me>