removing get-preview-ajax.php file as duplicate code. Using gp-catalog-ajax.php for feed preview and using catalog.js for javascript functionality
added changes from auto742 to avoid conflicts
including scripts from dispatcher
Merge branch 'auto723' into auto742

Conflicts:
	src/GrabPress.php
Merge branch 'auto742' of https://github.com/GrabNetworks/grabpress into auto742
added validation to both catalog page and preview modal window