fixed doubled error message when '..require the same content..'
fixed too long inputs in license (search form)
Fix MySQL migrations - delete unique index
Merge pull request #267 from xliiv/double-error-msg

fixed-double-error-msg
Merge pull request #268 from xliiv/fit-license-fields

Fixed fields length in license form
Import assets - fix category query
Merge branch 'develop' of https://github.com/allegro/ralph_assets into develop
Fix mode in asset import
Fix AssetCategory query - AssetType != AssetCategoryType
Admin - change list display, list filters.