ENYO-1741: A Sign-In error Pop-up appears if the user open the "Project Properties" Pop-up and he is not authentified in his Phonegap account.

The Sign-In error Pop-up (Ares.SignInErrorPopup) is inherited from the" Ares.Error" Pop-up, and have in addition a "Sign In" button that show the "Account" Pop-up.
Merge branch 'master' of github.com:enyojs/ares-project into ENYO-1741
ENYO-1741: Remove the global variable "ares" from SignInErrorPopup because it's not used.
ENYO-1741: re-enable real-life verification
ENYO-1741: the Phonegap Build panel is no longer registred as a component in "Ares".
Merge branch 'ENYO-1741' of github.com:enyojs/ares-project into ENYO-1741

Conflicts:
	ares/source/Ares.js
ENYO-1741: adding two messages in the top of the panel "Phonegap Build" to display the status of the connection to the Phonegap account.

There are three status :
The user is authentified : the AppId label and the AppId input are displayed.
Ares is processing the authenfication action : the message "Looking for Phonegap account data ..." is displayed.
The authenfication action failed : the messsage "Sign-in is required" is displayed.
Merge branch 'ENYO-1741' of github.com:enyojs/ares-project into ENYO-1741
Merge pull request #470 from enyojs/ENYO-1741

ENYO-1741: A Sign-In error Pop-up appears if the user open the "Project ...