travis: Add initial travis config.

.travis.yml

@@ -0,0 +1,17 @@
+language: rust
+rust: stable
+
+jobs:
+  include:
+    - os: linux
+      dist: bionic
+
+    - os: osx
+
+before_script:
+  - rustup component add rustfmt
+
+script:
+  - cargo build  --no-default-features --features 'encryption'
+  - cargo fmt --all --no-default-features --features 'encryption' -- --check
+  - cargo test --no-default-features --features 'encryption'