Version 0.7.3
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* Refactored main menu navigation and converted all apps to this new
  system
* Multi item links are now displayed on top of generic lists as well as
  on the bottom
* Spanish translation updates
* Updated requirements to use the latest development version of
  django-mptt
* Improved user folder document removal views
* Added ability to specify default metadata or metadataset per
  document type
* Converted filename handling to use os.path library for improved 
  portability
* Added edit source object attribute difference detection and logging
  to history app
* Missing metadata type in a document during a multi document editing doesn't raise errors anymore.

  - This allows for multi document heterogeneous metadata editing in a single step.
    
* Added document multi item links in search results

  - Direct editing can be done from the search result list
    
* Permissions are now grouped and assigned a group name
* Improved role management views
* Document type is now an optional document property

  - Documents can be created without an explicit document type
    
* Added support for per user staging directories
* Updated logos