added slots in asset model, yield with assests for api
added migration
fix models name
added is_deprecated() to asset model, fix tests
added is_deprecated() to asset model, fix tests
change slot field as FloatFiled
fix migration
Merge pull request #5 from wmatyskiewicz/api

added slots in asset model, yield with assets for api, fixed migrations
test api, fixed model type
Initial work on imports
Merge branch 'master' of https://github.com/allegro/ralph_assets
Merge branch 'api' of github.com:wmatyskiewicz/ralph_assets
clean up imports
Merge pull request #6 from wmatyskiewicz/api

test api, fixed model type
remove unusage date
Merge pull request #7 from wmatyskiewicz/api

remove unusage date
Work in progress
Merge.
Improved creating device
Preparing for import