Add travis config

Signed-off-by: Gábor Lipták <gliptak@gmail.com>

.travis.yml

@@ -0,0 +1,26 @@
+dist: trusty
+sudo: required
+
+language: go
+
+go:
+  - 1.7
+  - tip
+
+go_import_path: github.com/docker/containerd
+
+addons:
+  apt:
+    packages:
+      - btrfs-tools
+
+install:
+  - wget https://github.com/google/protobuf/releases/download/v3.1.0/protoc-3.1.0-linux-x86_64.zip -O /tmp/protoc-3.1.0-linux-x86_64.zip
+  - unzip -o -d /tmp/protobuf /tmp/protoc-3.1.0-linux-x86_64.zip
+  - export PATH=$PATH:/tmp/protobuf/bin/
+  - go get -d ./...
+  - go get -u github.com/golang/lint/golint
+  - go get -u github.com/stretchr/testify/assert
+
+script:
+  - sudo PATH=$PATH GOPATH=$GOPATH make binaries coverage