Attempt to use travis_wait to work around time outs:

> No output has been received in the last 10m0s, this potentially indicates
> a stalled build or something wrong with the build itself.

Fix #74

Author: SimonSapin

.travis.yml

@@ -7,6 +7,11 @@ rust:
   - nightly
 services:
   - docker
+before_script:
+  - if [ "$TARGET" = "arm-linux-androideabi" ]; then
+      travis_wait docker pull alexcrichton/rust-slave-android:2015-11-22;
+    fi
+
 script:
   - if [[ $TRAVIS_RUST_VERSION = nightly* ]]; then
       sh ci/run-travis.sh;