create documentation page for parallax.js
update parallax.js to v0.9.1
remove README.md file from gh-pages branch
update parallax.js to v1.0 and update documentation
add link to github repo within the documentation header
make options table responsive on smaller devices
place a notice on the documentation page for visiting iOS users
resize parallax containers to a size relative to the window height
add google analytics tracking code
update parallax.js to v1.1 and add position option to the documentation