fixed deleting unique from 14 migration
Merge pull request #295 from mkurek/fix/unique-in-migrations

fixed deleting unique from 14 migration
fixed static files linking
Merge pull request #300 from mkurek/fix/static-files

[pricing] fixed static files linking
fixed pricing_asset_models and pricing_assets_with_devices unit tests
Merge pull request #336 from mkurek/fix/unit-tests

fixed pricing_asset_models and pricing_assets_with_devices unit tests