Make CircleCI check out Meta.

This checks out meta, updates the client repo to the right branch
(to cope with PRs, rather than master builds), then runs the client
tests.

DMDirc/Infrastructure#62

circle.yml

     TERM: dumb
 
 checkout:
+  override:
+    - git clone https://github.com/DMDirc/Meta.git DMDirc
+    - git submodule update --init --remote
+    - cd DMDirc/client
+    - git fetch origin $CIRCLE_BRANCH:circleci
+    - git fetch --tags
+    - git checkout circleci
   post:
-    - "if [ -e .git/shallow ]; then git fetch --unshallow; fi"
     - git fetch --tags
 
 dependencies:
   override:
-    - ./gradlew --parallel assemble
+    - ./gradlew --parallel client:dependencies plugins:dependencies
 
 test:
   override:
-    - ./gradlew --stacktrace --parallel test
+    - ./gradlew --stacktrace --parallel client:test