support for deployments to cloudfoundry (#116)

* support for deploying to cloudfoundry

* tweaking readme

deployments/cloudfoundry/README.md

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+# golang-url-shortener on cloudfoundry
+
+## configuration 
+
+1. Either compile or download the linux amd64 binary and copy it into this directory (e.g. `cp ../../releases/golang-url-shortener_linux_amd64/golang-url-shortener .` if you compiled it yourself via make)
+1. `cp manifest-example.yml manifest.yml` and edit to meet your needs
+1. (optional) create any services that may be required for securing env variables or things like redis, for example:
+   * creating a cups service to hold oauth keys: `cf create-user-provided-service gourl-oauth -p '{"githubClientID":"<some id>","githubClientSecret":"<some key>"}'`
+   * creating a redis service for later binding: `cf create-service thd-redis default gourl-redis-service`
+1. (optional) modify run.sh to set `REDIS_SERVICE_NAME` to match the name of the redis service for your cloudfoundry implementation
+
+## deployment
+
+`cf push` or `cf push <custom app name>`

deployments/cloudfoundry/manifest-example.yml

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+applications:
+- name: gourl
+  buildpack: binary_buildpack
+  memory: 64m
+  command: './run.sh'
+  instances: 1 # should not be more than 1 due to session handling
+  health-check-type: http
+  health-check-http-endpoint: /ok
+  # if you use any marketplace or cups services, define the binding here
+  # services:
+  # - gourl-redis-service
+  # - gourl-oauth
+  # define any configuration settings via environment variables here (see https://github.com/mxschmitt/golang-url-shortener/wiki/Configuration)
+  env:
+   GUS_BASE_URL: "https://gourl.mydomain.com"
+   GUS_BACKEND: redis
+   GUS_SHORTED_ID_LENGTH: 5
+   GUS_ENABLE_DEBUG_MODE: false
+  

deployments/cloudfoundry/run.sh

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+#!/bin/sh
+
+REDIS_SERVICE_NAME="thd-redis"
+
+CUPS=$(echo $VCAP_SERVICES | grep "user-provided")
+REDIS=$(echo $VCAP_SERVICES | grep "$REDIS_SERVICE_NAME")
+
+if [ "$CUPS" != "" ]; then
+    export GUS_GITHUB_CLIENT_ID="$(echo $VCAP_SERVICES | jq -r '.["'user-provided'"][0].credentials.githubClientID')"
+    export GUS_GITHUB_CLIENT_SECRET="$(echo $VCAP_SERVICES | jq -r '.["'user-provided'"][0].credentials.githubClientSecret')"
+fi
+
+if [ "$REDIS" != "" ]; then
+    export GUS_REDIS_HOST="$(echo $VCAP_SERVICES | jq -r '.["'$REDIS_SERVICE_NAME'"][0].credentials.host'):$(echo $VCAP_SERVICES | jq -r '.["'$REDIS_SERVICE_NAME'"][0].credentials.port')"
+    export GUS_REDIS_PASSWORD="$(echo $VCAP_SERVICES | jq -r '.["'$REDIS_SERVICE_NAME'"][0].credentials.password')"
+fi
+
+echo "#### Starting golang-url-shortener..."
+
+./golang-url-shortener