Add OWNERS to Jinja2 (Python template library)

Jinja2 package is missing OWNERS; I've added one as per: 
http://www.chromium.org/developers/adding-3rd-party-libraries#TOC-Add-OWNERS

Split off from:
Update Jinja2 (Python template library) to 2.7.1
https://codereview.chromium.org/23506004/

TBR=cpu@chromium.org

Review URL: https://chromiumcodereview.appspot.com/23537008

Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 367fb653f4e316d9a095f3c29c7baf03b21ffb78
2 files changed