add travis integration

.travis.yml

@@ -0,0 +1,56 @@
+language: rust
+cache: cargo
+dist: trusty
+sudo: true
+os:
+  - linux
+  - osx
+
+rust:
+  - nightly
+
+before_install:
+  - sudo apt-get update
+
+addons:
+  apt:
+    packages:
+      - libcurl4-openssl-dev
+      - libelf-dev
+      - libdw-dev
+      - cmake
+      - gcc
+      - binutils-dev
+
+script:
+  - cargo build
+  - cargo test
+  - |
+      if [[ "$TRAVIS_RUST_VERSION" == "nightly" && $CLIPPY ]]; then
+        cargo clippy
+      fi
+
+before_script:
+  - |
+      if [[ "$TRAVIS_RUST_VERSION" == "nightly" ]]; then
+        ( ( cargo install clippy && export CLIPPY=true ) || export CLIPPY=false );
+      fi
+  - export PATH=$PATH:~/.cargo/bin
+
+after_success:
+  - |
+      if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then
+        wget https://github.com/SimonKagstrom/kcov/archive/master.tar.gz &&
+        tar xzf master.tar.gz &&
+        cd kcov-master &&
+        mkdir build &&
+        cd build &&
+        cmake .. &&
+        make &&
+        sudo make install &&
+        cd ../.. &&
+        rm -rf kcov-master &&
+        for file in target/debug/examplerust-*[^\.d]; do mkdir -p "target/cov/$(basename $file)"; kcov --exclude-pattern=/.cargo,/usr/lib --verify "target/cov/$(basename $file)" "$file"; done &&
+        bash <(curl -s https://codecov.io/bash) &&
+        echo "Uploaded code coverage"
+      fi