added delete flight

delete flight function added to FlightsController.php
View/Flights/index.ctp contains the ‘Delete Flight’ button
Merge pull request #2 from jbaird42/master

added delete flight
delete flight now deletes logs too!

delete flight will now remove all logs for that flight from the database
Update deleteLog()

Updated deleteLog in Log.php to evaluate to true if all logs are deleted.
Merge pull request #3 from jbaird42/master

delete flight now deletes logs too!
Merge pull request #3 from algotechgroup/master

Update