small improvements to the server logic
changing the current line status to use our server
changing the weekend status updater to use our server

the parser specific for the weekend results was removed
because now the data format is exactly the same
improving handling when we don't have any data in the server

this could happen just after we initialize the server
improving settings framework for the backend
removing debug flag from the request handlers
new and improved mechanism for doing network calls
removing client alert_id from the server as we are not doing anything with it
changes in configuration to make the app prod-ready
improving the logic of finding affected users to avoid duplicates
change the code so it still works in case we have a new LineStatus
refactoring/cleanup
alert triggered objects now know the alert id they refer to
new request type: post
GCM messaging: registration and message reception