* Updated link

Old link was 404
Link in the form http://help.github.com/creating-a-pull-request (like the previous) does not exist as far as I know
http instead of https (like the previous)

* Updated link

* Added "Questions"-section

A tab like this is included in most netflix repos.

Text and format copied from here:
https://github.com/Netflix/dynomite/blob/dev/CONTRIBUTING.md
https://github.com/Netflix/dyno/blob/master/CONTRIBUTING.md