Fixing release notes for upcoming 0.9.13 release
Adding Rubicon Project.com

Used in the main photo of the website.
Fix querystring cross site nastiness
Merge pull request #1055 from fhossain/querystring_escaping

Fix querystring cross site nastiness
Merge pull request #1052 from enlewof/patch-1

Adding Rubicon Project.com
Adding latest commit to release notes
Merge pull request #1051 from deniszh/master_0.9.13_releasenotes

Fixing release notes for upcoming 0.9.13 release
Adding pytz test for check_dependencies.py

Fixing issue #1019
Adding pytz as dependency into install documentation
Merge pull request #1062 from deniszh/master_pytz

Master pytz