ENYO-3354: add the function "addNoneElement" to the kind "Phonegap.ProjectProperties.PickerRow" and use it to create a "None" element in any picker that have the "none" attribute in it's row definition.
ENY-3354: the "none" attribute is moved from the published block
ENYO-3354: the "none" element of the max-sdk version is placed on the top of the list.
ENYO-3354: the "none" element of a picker instance is placed on the top of the list.
ENYO-3354: remove some Line return.
Merge pull request #691 from enyojs/ENYO-3354

ENYO-3354: Add a function to "Phonegap.ProjectProperties.Picker" in order to define a "None" element