Merge pull request #1 from melenevsky/master

No need of of displaying label if label do not exists
Merge pull request #2 from melenevsky/quickfix

Quickfix, fixed loading of django apps
Merge pull request #3 from melenevsky/quickfix

Quickfix, muted error when using custom filters
added detection if adminfilters were enabled for current ModelAdmin instance
removed duplicate code, added docstrings
minor change in readme and comments
added ordering by multiple fields
added initial migrations for south
minor fix for ordering
fix for ordering saving
handling case when field cannot be loaded after renaming or deleting
Added gitignore file