Add travis and fix Dockerfile for test files

.travis.yml

+sudo: required
+
+services:
+      - docker
+before_install:
+    - docker pull golang:1.7.3
+
+script:
+    - sh build.sh
+

build.sh

-#!/bin/sh
+#!/bin/bash
 
-# First do - git clone https://github.com/alexellis/faas && cd faas
+(cd gateway && ./build.sh)
+(cd watchdog && ./build.sh)
 
-docker network create --driver overlay --attachable functions
 
-cd watchdog
-./build.sh
-
-cp ./fwatchdog ../sample-functions/catservice/
-
-docker build --build-arg https_proxy=$https_proxy --build-arg http_proxy=$http_proxy \
-    -t alexellis2/faas-catservice .
- #docker service rm catservice ; docker service create --network=functions --name catservice alexellis2/faas-catservice
-
-cd ..
-
-cd gateway
-./build.sh
-# docker rm -f server; docker run -d -v /var/run/docker.sock:/var/run/docker.sock --name server -p 8080:8080 --network=functions alexellis2/faas-gateway

watchdog/Dockerfile

 FROM golang:1.7.3
 RUN mkdir -p /go/src/app
-COPY main.go /go/src/app
+WORKDIR /go/src/app
+COPY main.go        .
+COPY readconfig.go  .
+COPY config_test.go .
+
 WORKDIR /go/src/app
 RUN go get -d -v
+
+RUN go test
 RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o app .
+