Added code coverage with cargo-travis.

.travis.yml

@@ -1,6 +1,28 @@
 language: rust
 rust: stable
-sudo: false
+sudo: true
+
+cache:
+  - apt
+  - cargo
+
+addons:
+  apt:
+    packages:
+      - libcurl4-openssl-dev
+      - libelf-dev
+      - libdw-dev
+      - binutils-dev
+      - cmake
+    sources:
+      - kalakris-cmake
+
+before_script:
+  - export PATH=$HOME/.cargo/bin:$PATH
+  - cargo install cargo-update || echo "cargo-update already installed"
+  - cargo install cargo-travis || echo "cargo-travis already installed"
+  - cargo install-update -a # update outdated cached binaries
+
 script:
   - chmod +x mktestconfig.sh
   - ./mktestconfig.sh
@@ -9,6 +31,10 @@ script:
   - cargo test --verbose --features "toml yaml"
   - cargo test --doc
   - cargo test --verbose --no-default-features
+
+after_success:
+  - cargo coveralls
+
 notifications:
   email: false
   irc: