Merge pull request #744 from zefciu/crash

Crash
Fixing travis
Merge pull request #746 from vi4m/develop

I hate travis
info about Celery removed from docs
fix
reverse fixes
Fixes IntegerField -> BigIntegerField issue of zabbix integration
unicode compatibility
type field in model object is PositiveIntegerField - it couldn't work
Merge pull request #749 from inc0/hotfix/network

reverse fixes
Merge pull request #747 from andrzej-jankowski/docs_fix

Info about Celery removed from docs
Merge branch 'develop' of https://github.com/allegro/ralph into develop
Fix for KeyError in search and test
Migration for CMDB Zabbix integration
Merge pull request #748 from andrzej-jankowski/search_fix

UI fixes
Merge pull request #750 from vi4m/develop

Fixes #726 - Zabbix CMDB Integration
The decoupling implemented
Flaked
Corrected tests to accomodate pluggableapps
Removed assets-specific settings