added curtain effect

files added:
Curtain.js Source.txt
scripts\lib\curtain.js
styles\curtain.css

files modified:
index.html
app.css
Merge branch 'master' of https://github.com/melvin15may/ascii

Conflicts:
	app/index.html
	app/styles/app.css

	modified:   app/index.html
	modified:   app/styles/app.css
	modified:   app/styles/app.css