Bump barback version to 0.11.1.
Bump barback version to 0.11.1.

R=rnystrom@google.com
BUG=

Review URL: https://codereview.chromium.org//178323004

git-svn-id: c93d8a2297af3b929165606efe145742a534bc71@32999 260f80e4-7a28-3924-810f-c04153c831b5

Aetet/barback,dart-lang/barback,dart-lang/barback,dart-archive/barback,dart-archive/barback,Aetet/barback