flight.js: Return flight reference from searchForPlane()
flight.js: Reduced array lookups in setPlaneOnMap() function
flight.js: Reduced array lookups in hidePlaneOnMap() functions
flight.js: Pass flight to set/hidePlaneOnMap() functions
js: Added slFlightCollection module
flight.js: Removed trivial functions
flight.js: Pass placeholder to initPhasesTable() function
Merge branch 'master' into flight-collection

Conflicts:
	skylines/templates/flights/map.jinja
	skylines/templates/flights/view.jinja
	skylines/templates/tracking/map.jinja
	skylines/templates/tracking/view.jinja
Merge pull request #26 from Turbo87/flight-collection

JS FlightCollection class