Changes:
-added airplanecollectionModel in order to have only one serialiable
file with all the airplanes data
Changes :
-Impemented Working serialization between airplaneListActivity and
 airplaneProfileActivity
 
 Bug:
 - If a profile's name, model or brand is modified it gets added as a
  new plane
 
 Todo:
 -Impement betweek airplaneProfileActivity and cruisePerformanceActivity
Merge branch 'master' of ssh://git@github.com/ManuelCintron/Walrus.git