Merge branch 'ralph_assets' of github.com:quamilek/ralph into ralph_assets

Conflicts:
	src/ralph/ui/widgets.py
Adding is_staff and is_superuser parameters in login_as_su()
Bugfix - wrong keyword name in method login_as_su in test raports
refactoring for a asynchronous tests
Change url name in CMDB CI main view
Add link to CI view into log
Documentation about Splunk Logger
Merge branch 'master' of git://github.com/allegro/ralph into dev
Merge branch 'master' of github.com:allegro/ralph into reports
merge
Merge pull request #473 from wmatyskiewicz/reports

refactoring for a asynchronous tests
Merge pull request #455 from quamilek/ralph_assets

Separate assets to ralph_assets package
Add device HistoryChange into SplunkLog
Add CIChangeCMDBHistory into SplunkLog and refactoring SplunkLogger
Merge pull request #474 from quamilek/dev

SplunkLogger for CMDB CIChangesGit and CIChangesPuppet
Merge pull request #470 from andrzej-jankowski/donpedro_api

DonPedro - installed software detection
Allow automatic undeleting of manually deleted devices
Add descripion in Preboot and Preboot file
Add migrations for description in Preboot and Preboot file in deployment
Merge branch 'master' of git://github.com/allegro/ralph into dev