Add color support to git cl and fetch issue properties in parallel.
Add color support to git cl and fetch issue properties in parallel.

Add cache for issue properties.

Add --fast option in case the HTTP requests become an issue.

Everyone loves colors:
- White means no issue is associated with the branch.
- Red means no email was sent to request a review. Also red if the issue doesn't
  exist anymore.
- Blue means the issue was not LGTM'ed yet.
- Green means the issue was LGTM'ed and is likely ready to commit or be CQ'ed.

R=iannucci@chromium.org
BUG=

Review URL: https://chromiumcodereview.appspot.com/19967004

git-svn-id: bd64dd6fa6f3f0ed0c0666d1018379882b742947@213265 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

svn2github/chromium-depot-tools,svn2github/chromium-depot-tools,svn2github/chromium-depot-tools