ENYO-3524: correct the mis-display of the QR code.
ENYO-3524: show the signing keys credentials password inputs.
ENYO-3524: add an error message displayed under the concerned picker row if the value saved in the file "project.json" is incorrect.
ENYO-3524: refactor the kind "Phonegap.ProjectProperties.SDKVersionRow" which inherit from "Phonegap.ProjectProperties.PickerRow" to use the functions hideErrorMessage() & showErrorMessage()
ENYO-3524: change a parameter name.
ENYO-3524: correct a typo.
ENYO-3524: refresh the displayed value on the picker when the error is corrected.
Merge pull request #670 from enyojs/ENYO-3524

ENYO-3524: Fixe issues about the positioning of the QR code, the selection of the signing Key & PGP version