Add Docker 1.6 RC2 to tested versions

Signed-off-by: Aanand Prasad <[email protected]>

Dockerfile

@@ -15,13 +15,15 @@ RUN set -ex; \
     ; \
     rm -rf /var/lib/apt/lists/*
 
-ENV ALL_DOCKER_VERSIONS 1.3.3 1.4.1 1.5.0
+ENV ALL_DOCKER_VERSIONS 1.3.3 1.4.1 1.5.0 1.6.0-rc2
 
 RUN set -ex; \
-    for v in ${ALL_DOCKER_VERSIONS}; do \
+    for v in 1.3.3 1.4.1 1.5.0; do \
         curl https://get.docker.com/builds/Linux/x86_64/docker-$v -o /usr/local/bin/docker-$v; \
         chmod +x /usr/local/bin/docker-$v; \
-    done
+    done; \
+    curl https://test.docker.com/builds/Linux/x86_64/docker-1.6.0-rc2 -o /usr/local/bin/docker-1.6.0-rc2; \
+    chmod +x /usr/local/bin/docker-1.6.0-rc2
 
 RUN useradd -d /home/user -m -s /bin/bash user
 WORKDIR /code/