Update GOM to use latest ARB username

I also updated app.yaml to ignore all the *.md files
and other bower_components files we don't actually need
to upload to GAE every time.

BUG=376604, 246294
NOTRY=true

Review URL: https://codereview.chromium.org/392173003

git-svn-id: svn://svn.chromium.org/blink/trunk@178301 bbb929c8-8fbe-4397-9dbb-9b2b20218538