Add coveralls in .travis.yml

.travis.yml

@@ -1,20 +1,47 @@
 language: rust
+sudo: false
+cache: cargo
+dist: trusty
+
+addons:
+  apt:
+    packages:
+      - libcurl4-openssl-dev
+      - libelf-dev
+      - libdw-dev
+      - binutils-dev
+
 rust:
   - stable
   - beta
   - nightly
 
+# load travis-cargo
+before_script:
+  - |
+      pip install 'travis-cargo<0.2' --user &&
+      export PATH=$HOME/.local/bin:$PATH
+  - cargo install cargo-travis --force && export PATH=$HOME/.cargo/bin:$PATH;
+
 script:
-  - cargo build --verbose --all
-  - cargo test --verbose --all
+  - |
+      travis-cargo build &&
+      travis-cargo test &&
+      travis-cargo bench &&
+      travis-cargo --only stable doc
 
 # Inspired from geal/nom
 after_success:
   - if [ "${TRAVIS_PULL_REQUEST_BRANCH:-$TRAVIS_BRANCH}" != "master" ] && [ "$TRAVIS_RUST_VERSION" == "nightly" ]; then
-        cargo install cargo-benchcmp --force;
-        cargo bench > benches-variable;
-        git fetch;
-        git checkout master;
-        cargo bench > benches-control;
-        cargo benchcmp benches-control benches-variable;
+      cargo install cargo-benchcmp --force;
+      cargo bench > benches-variable;
+      git fetch;
+      git checkout master;
+      cargo bench > benches-control;
+      cargo benchcmp benches-control benches-variable;
     fi
+  - cargo coveralls --verbose;
+
+env:
+  global:
+    - TRAVIS_CARGO_NIGHTLY_FEATURE=""