client side event handling
change the way to affect countries and put one army on them
highlight selectable countries
add a message by mode
handle move (battle and fortification)
add an auto-setup bool to skip setup
move auto setup on engine
simplify StringToInt transformer
use map selection of polymer for CSS
extract method to avoid dupplicated code
Merge pull request #36 from ggirou/polymer

[WIP] client side event handling
fix build failure
Merge pull request #37 from ggirou/fix-build-failure

fix build failure
Add checks and tests