travis: Add Travis CI support

Currently builds for Ubuntu 15.10 amd64 with gcc 5 under docker.

Signed-off-by: Joel Stanley <joel@jms.id.au>
diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 0000000..faaa918
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,9 @@
+sudo: required
+
+services:
+    - docker
+
+language: c
+
+script:
+    - ./.build.sh