modified Timestampable and Blameable behaviors to accept an array of tracked fields
modified Timestampable and Blameable behaviors to accept an array of tracked fields
added attribute checking to the new many-to-one part of the Blameable XML driver
Merge branch 'timestampable-field-array' of github.com:smatyas/DoctrineExtensions into timestampable-field-array

Conflicts:
	doc/blameable.md
	lib/Gedmo/Blameable/Mapping/Driver/Xml.php
Merge pull request #776 from smatyas/timestampable-field-array

[Timestampable][Blameable] accept array for field property