Add shrink-header.css

as codrops.com animatedHeader.js v1.0.0
Init .bowerrc

with only bower_components as directory
Init .gitignore

with bower_components
Update bower.json

add classie@1.0.0 as dependencies
Add demo.html

provide a minimal usage example
Rm .gitignore

dont ignore bower_components
Add bower_components

keep run :ok_hand:
Rename demo.html to index.html

for name conventions of gh-pages