Load md5 and Jcrop scripts and styles from their new locations.

They could not be loaded as they have been replaced by their bower
counterparts with
owncloud/core@49fbd766c2ad6e5bc7c8401bfab2c20b1f442012 and
owncloud/core@73569b29bc3984e1e6df102faccb3c02c20573b3
You could simply omit the empty string AFAIK