ENYO-3037: Require non top-level directory for project creation

Enyo-DCO-1.1-Signed-off-by: Jeremy Thomas <jeremy.thomas@lge.com>
Adding serverSelectable property for better selection control
Merge pull request #577 from enyojs/ENYO-3037-jeremythomas

ENYO-3037: Require non top-level directory for project creation