Changes from 1.3 to 1.3.1
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-- Work for both eZ publish 3.3-x and eZ publish 3.4.

-- Fixed bug of content can't be saved because of attibute_base is missing.

-- Fixed bug of OE crash when a non-existing object is referred.

-- Added support for multiple line break.

-- Fixed bug of header and table class can't be saved.

-- Added context menu method 'Remove Link' for literal. This can be used to 
   remove all link format in literal text.

-- Added i18n operator to all templates.

-- Fixed bug of insert object window showing empty image when there is no related objects.

-- Fixed bug of unable to add image besides line tag. 

-- Fixed bug of lost content when edit attribute of custom tag.

-- Added version compatible check for eZ publish.