webdriver: Merge pull request #27 from jgraham/travis

Add travis CI support.

Source-Repo: https://github.com/mozilla/webdriver-rust
Source-Revision: 63a82d36d2783128665612e41faf5b150eb3dbf8

--HG--
extra : subtree_source : http%3A//tristan.corp.lon2.mozilla.com%3A8000
extra : subtree_revision : 8dae95ce9c85bfc09fd340f9e74c58fdec359e5d

testing/webdriver/.travis.yml

@@ -0,0 +1,9 @@
+language: rust
+
+rust:
+    - nightly
+    - stable
+
+script:
+    - cargo build --verbose
+    - cargo test --verbose