ENYO-3462 : Fix Save & Close Error on Designer

Enyo-DCO-1.1-Signed-off-by: Hyun Kim <hyunk@mbridge.co.kr>
ENYO-3521: change the button name from "cancelWaitPopup" to "cancelBuildButton".
ENYO-3521: the hidding of the cancelBuildButton is done when the Popup is hidden.
ENYO-3521: use an ENYO function to abort a build.
Merge pull request #659 from enyojs/ENYO-3462

ENYO-3462 : Fix Save & Close Error on Designer
ENYO-3553: Fixed missing onError event declaration

Enyo-DCO-1.1-Signed-off-by: Yves Del Medico <yves.del-medico@hp.com>
Merge pull request #668 from enyojs/ENYO-3553

ENYO-3553: Fixed missing onError event declaration
ENYO-3532: add the HP Slate 7 tablet the the Preview's devices liste.
ENYO-3532: commit to refresh Travis build.
Merge pull request #669 from enyojs/ENYO-3532

ENYO-3532: add the HP Slate 7 tablet the the Preview's devices liste.
ENYO-3524: correct the mis-display of the QR code.
Merge pull request #666 from enyojs/ENYO-3521

ENYO-3521: fix an undesired apparition of the button "cancel" on the wait Pop-up during the 1st phase of PGB action.
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
start working on 0.2.8-pre.2