Add description of the game in README.md
Change the image of the target state
Update color of body, game container, and cells
Add icon and make the app looks nice on phones
Fix typo in summary
Prevent default behavior of keydown event to avoid having the screen scrolling up and down
Fix bug of disabling wrong keydown events
Emit and catch game 'won' event
Create modal dialog when game is won and lock the board at that time
Handle modal dialog closed and dismissed by starting a new game
Merge branch 'master' into layout

Conflicts:
	js/app.js
Add link to share game completion on social network
Restructure the layout
Define pause and resume behavior
Create template folder and move html template for game-won modal dialog there
Create the guide as a template and load it as a modal dialog
Fix the link to target state image to be relative URL
Create a separate image to show target state
Fix link to target state image in the guide template