oauth2: Add OAuth2 audience claim and improve migrations

This patch adds the ability to whitelist and request an audience
when performing any OAuth 2.0 Flow. The audience is useful in multi-
tenant environments where access tokens should be restricted to certain
resources.

Closes #883
Closes #1144

Signed-off-by: arekkas <aeneas@ory.am>

.circleci/config.yml

@@ -67,6 +67,8 @@ jobs:
     working_directory: /go/src/github.com/ory/hydra
     steps:
       - checkout
+      - run: sudo apt-get update -y
+      - run: sudo apt-get install -y default-jdk
       - run: make init
       - run:
           name: Enable go1.11 modules