Merge branch 'rs-routes' into 'master'

Add a basic `/` route; move old `/` route to `/system_hook`

See merge request !2

app.rb

@@ -8,12 +8,16 @@ class MarketoTools < Sinatra::Base
     username == ENV['AUTH_USERNAME'] && password == ENV['AUTH_PASSWORD']
   end
 
+  get '/' do
+    'success'
+  end
+
   # Receives GitLab System Hooks
   #
   # Specifically, we're interested in the `user_create` event.
   #
   # See http://gitlab.com/help/system_hooks/system_hooks
-  post '/' do
+  post '/system_hook' do
     begin
       params = JSON.parse(request.body.read)
     rescue JSON::ParserError