Add hello UiAction

Add UiAction "Say hello" for RevisionResource. It works on both old and new
change screens. User has to be logged in to see the buttton. Alert window
is shown with greeting message. Popup dialog with language selection will be
added in follow up commit.

Change-Id: Ifc192ed64be761da1517f681340b8afa629cf0a7
6 files changed
tree: 51f6a6f601d5031561b6e55054efcb84e23b68a3
  1. src/
  2. .gitignore
  3. BUCK
  4. LICENSE
  5. pom.xml