Add travis config and minor tweaks to gitignore

.gitignore

@@ -1,2 +1,4 @@
 target/
 Cargo.lock
+.emacs*
+*~

.travis.yml

@@ -0,0 +1,19 @@
+language: rust
+sudo: false
+rust:
+  - stable
+  - beta
+  - nightly
+before_script:
+  - pip install 'travis-cargo<0.2' --user && export PATH=$HOME/.local/bin:$PATH
+script:
+  - cargo build --verbose
+  - cargo build --verbose --no-default-features
+  - cargo test --verbose
+  - cargo test --verbose --no-default-features
+after_success:
+  - travis-cargo --only nightly doc-upload
+
+notifications:
+  email:
+on_success: never