refactored and parallelised the contacts migration
created a generic migration class for parallel migrations.
removed need to call checkForkPossible()
Merge branch 'release/1.4' into feature/parallel_contacts

Conflicts:
	protected/migrations/m130320_144412_contacts_refactoring.php
Merge branch 'release/1.4' into feature/parallel_contacts
+ [OE-3374] added support for validation scenarios for child and parent elements in nested elements.
+ more phpdoc
[OE-3363] Added functionaility to dynamically rescale the dialog so that it never displays outside of the window viewport; adjusted the iframe dimensions so that it always displayed within the constraints of the dialog
Dialog comment wording fix
Merge branch 'release/1.4' into develop