Fixes grammar issue in README.md
Merge pull request #278 from ktagliabue/master

Fixes small grammar issue in README file.
linked to impress.js from README
fixed overload animation to run on present
gold plating README
updating examples and comments
cleaned up substep functions, added events
more gold plating for demo
cleaning up example code
updating with link, fixing styles
improved comments
GPL version clarification
fix retrieving previous substep

threw an error on the console
Merge pull request #1 from lucas-clemente/patch-1

fix retrieving previous substep
select a step more precisely.
Merge pull request #288 from jenil27/master

auto-resizing doesn't work when `active` class is used anythere on a page
added impress.js challenge banner
Typo

:)
Merge pull request #300 from DronRathore/readme.md---typo

Typo in README
end of challenge