clarifying cf manifest and adding to gitignore (mxschmitt#123)

Author: billimek

.gitignore

@@ -24,3 +24,9 @@ debug.test
 /releases
 /docker_releases
 data
+
+/deployments/cloudfoundry
+!/deployments/cloudfoundry/README.md
+!/deployments/cloudfoundry/config.yaml
+!/deployments/cloudfoundry/manifest-example.yml
+!/deployments/cloudfoundry/run.sh

deployments/cloudfoundry/manifest-example.yml

@@ -3,7 +3,7 @@ applications:
   buildpack: binary_buildpack
   memory: 64m
   command: './run.sh'
-  instances: 1 # should not be more than 1 due to session handling
+  instances: 1 # only use > 1 if you are using redis as the backend
   health-check-type: http
   health-check-http-endpoint: /ok
   # if you use any marketplace or cups services, define the binding here