Start WPDK HTTP Request model
Added `_WPDKPost::imageContent()` and `_WPDKPost::imageContentWithID()` to get the first post content image
Added `_WPDKPost::imageAttachments()` and `_WPDKPost::imageAttachmentsWithID()` to get attachments post images
Cosmetic
Signal deprecated
Updated under the hood
Removed HTML comments ( jQuery remove() does not remove outer HTML content )
Fixed unsense...
See https://github.com/twbs/bootstrap/issues/9855
Updated for v1.3.1
Merge branch 'master' into beta