FetchUserDataWithNumber check firebase to see if the user exists in our database.

GetFirebaseClient creates and returns a new firebase client, used to interact with the database.

LookupUserNumber looks up a user's phone number from their uid.

MakeAtlasSectionRequest makes a request to Atlas for section data in the term, department, and course.

MoveTrackedSection moves old sections out of the prod area.

ParseSectionResponse turns the http.Response into a slice of sections.

SendText sends a text message to the specified phone number.