fn: improve docs (#377)

Continues #359

examples/hello/ruby/README.md

@@ -11,8 +11,10 @@ docker run --rm -v "$PWD":/worker -w /worker iron/ruby:dev bundle install --stan
 fn build
 # test it
 cat hello.payload.json | fn run
+# push it to Docker Hub
+fn push
 # Create a route to this function on IronFunctions
-fn deploy myapp
+fn routes create myapp /hello
 ```
 
 Now surf to: http://localhost:8080/r/myapp/hello

examples/slackbot/guppy/README.md

@@ -11,8 +11,10 @@ docker run --rm -v "$PWD":/worker -w /worker iron/ruby:dev bundle install --stan
 fn build
 # test it
 cat slack.payload | fn run
+# push it to Docker Hub
+fn push
 # Create a route to this function on IronFunctions
-fn deploy slackbot
+fn routes create slackbot /guppy
 # Change the route response header content-type to application/json
 curl -X PUT http://127.0.0.1:8080/v1/apps/slackbot/routes/guppy -d '{ "route": { "headers": { "Content-type": ["application/json"] } } }'
 ```