Enyo 2425: Display an error message when the build start if the AppId is incorrect

How to test : 
- Edit the input of "Phonegap Build" panel with a correct AppId form the Phonegap build Account (if you have access to the account Jammie@hp.com, then you can use the  AppId : 472065)
- Launch the build
The build should succeed

- Edit the input of "Phonegap Build" panel with an incorrect AppID (Any Random String can do it)
- Launch the build
The build should fail the this error message :  " The AppId  0000000 do not exist in the Phonegap Build account Jammie@hp.com. Please choose a correct AppId";

Ready for review 
Enyo-DCO-1.1-Signed-off-by: Rafik Adiche mahmoud-rafik.adiche@hp.com