Slugifying the names
Convert to unicode and report UTF-8 errors
Used forms intead of storage where possible
Fixes for asset import
Sluggy related values handled
Validation error for missing columns
Catching and reporting import errors
Tests update
Flaked
Corrections from PR
Merge pull request #138 from zefciu/RBM-52

Preparation for RBM import
Flake8 command in .travis.yml
remove flake8 errors
Merge branch 'develop' of https://github.com/quamilek/ralph_assets into flake8
Merge pull request #139 from quamilek/flake8

Add Flake8 command in .travis.yml and remove flake8 error
Merge branch 'develop' of https://github.com/allegro/ralph_assets into micro-workflow
from_status is not required in Transition model