Flight duration

Added duration column to flights table - duration of flight in seconds

Added logic to FlightsController, Flight Model, and Log Model to
calculate duration
added add() to Users

Can now add users by using a cdv
Change responsibilities

Oneill working on Flight Flagging
Merge pull request #4 from infomodity/master

Flight duration
Added users back to TableCreationSQL.txt
Merge pull request #5 from jbaird42/master

added add() to Users
Merge pull request #6 from speedaddict81/master

Change responsibilities
Changes
Merge commit
Merge