[Add] add date_picker.js
[Delete] delete newtrip_02.html
[Add] add 2 new html files

- modal_add_trip_add_place.html
- modal_add_trip_edit_place.html
[Add] add modal_add_trip.js that contain modalAddTripCtrl
[Modify][create_trip.js] add 3 constants and a number of functions

- updateTrips (inject $http)
- dateBegin & dateEnd getter setter
[Modify][core.js] edit injections
[Modify][modal_add_trip.html] implement the input form content
[Modify][tripster.html] add new required scripts
[Modify][my_trip.js] handle cancel on click