v1.5.3

• Fixed XSS vulnerability
• Support nested categories in the navbar menu
• SQLAlchemy
  • sort on multiple columns with column_default_sort
  • sort on related models in column_sortable_list
  • fix: inline model forms can now also be used for models with multiple primary keys
  • support for using mapped column_property
• Upgrade Leaflet and Leaflet.draw plugins, used for geoalchemy integration
• Specify minimum_input_length for ajax widget
• Peewee: support composite keys
• MongoEngine: when searching/filtering the input is now regarded as case-insensitive by default
• FileAdmin
  • handle special characters in filename
  • fix a bug with listing directories on Windows
  • avoid raising an exception when unknown sort parameter is encountered
• WTForms 3 support