CI building for more rust versions.

.travis.yml

@@ -0,0 +1,16 @@
+language: rust
+rust:
+    - stable
+    - beta
+    - nightly
+
+matrix:
+    allow_failures:
+        - rust: nightly
+    fast_finish: true
+
+cache: cargo
+
+# Custom directory, for the correct year
+before_script:
+    - cd 2016