add travis for go part

.travis.yml

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+dist: trusty
+sudo: required
+
+language: go
+
+go:
+  - 1.8.x
+
+services:
+  - docker
+
+env:
+  matrix:
+    - MONGODB_IMAGE=mongo:2.6
+    - MONGODB_IMAGE=mongo:3.0
+    - MONGODB_IMAGE=mongo:3.2
+    - MONGODB_IMAGE=mongo:3.4
+    - MONGODB_IMAGE=percona/percona-server-mongodb:3.0
+    - MONGODB_IMAGE=percona/percona-server-mongodb:3.2
+    - MONGODB_IMAGE=percona/percona-server-mongodb:3.4
+
+matrix:
+  include:
+    - go: tip
+      env:
+
+install:
+  - go get -u github.com/Masterminds/glide
+  # remove vendor dir and re-fetch it to check later if it's correct with `git diff --exit-code`
+  - rm -rf vendor/
+  - glide install
+  # check if vendor dir is correct
+  - git diff --exit-code
+
+before_script:
+  # run docker containers
+  - docker-compose up -d
+  # log versions
+  - docker --version
+  - docker-compose --version
+  - docker-compose exec mongo mongo --version
+  # we need at least one document in test db
+  - mongo --eval 'db.init.insert({})'
+
+script:
+  - go test -timeout 1m $(glide nv)
+
+notifications:
+  email: false
+  slack:
+    on_success: change
+    on_failure: change
+    rooms:
+      secure: E5ZRDFtbVmQCo2SLCdvecpaRIZPC35+0srkyA9jVq0BJpvVY6pm4OQceAugy/g5cd6c2reTN9oNSjNF62BKpoJxPuIuu8/JdlvUMMxgxnGkCC1R6hAddbapvIe4EXlybLPGy8kAG7OkYVpGHtWwN3U5MfF7/tGeqL2y8C3fCDZA=

docker-compose.yml

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+version: '3'
+services:
+  mongo:
+    image: ${MONGODB_IMAGE:-percona/percona-server-mongodb:3.4}
+    ports:
+      - "27017:27017"