Merge pull request #1 from kevinshopoff/master

Updated USA image file name
Merge pull request #2 from kevinshopoff/master

updated button functionality to work on Enter
Merge pull request #3 from kevinshopoff/master

Updated USA image file name (again)
Merge pull request #4 from kevinshopoff/master

added comments to javascript
Merge pull request #5 from kevinshopoff/gh-pages

keypress enter now working