Switch from codereview.chromium.org to codereview.appspot.com

Experience from the other intern projects suggest that the Appspot site
is a little bit better than using the Chromium one for a non-Chromium
project.

R=mikelawther@chromium.org

Review URL: https://codereview.appspot.com/39240043
Added myself to the CC list.

R=alancutter@chromium.org

Review URL: https://codereview.appspot.com/39260044
Added Mike to CC list.

R=alancutter@chromium.org, alancutter@google.com

Review URL: https://codereview.appspot.com/39270043
Add Patti to CC list.

R=alancutter@chromium.org

Review URL: https://codereview.appspot.com/39300043
Update polymer and web animations links, fix typo breaking JSON parsing.

R=alancutter@chromium.org

Review URL: https://codereview.appspot.com/39870043