added worker job ttl
Update changes.rst and upgrade version of projects and requirements
Merge pull request #319 from mkurek/fix/workers-flush

added worker job ttl
fix for asset when saving with integrity error; minor admin performance fixes
added model to virtual
added menu items for user with scrooge access or superuser
fix dependent services cost calculation
fixed first level menu
Merge pull request #325 from mkurek/fix/pricing-service-dependent-costs

fix dependent services cost calculation
Merge pull request #320 from mkurek/feature/virtual-models

added model to virtual
Merge pull request #321 from mkurek/fix/asset-plugin-integrity-error

fix for asset when saving with integrity error; minor admin performance ...
big #loading-bar-spinner - cover all content
Merge pull request #324 from mkurek/feature/menu-links

Feature/menu links
Merge pull request #327 from ar4s/cover-all-during-data-is-loading

Big #loading-bar-spinner - cover all content
added ability to save usages by service name or id (instead of unused symbol)
fixed assets commands unit tests
Merge pull request #322 from mkurek/feature/api-save-by-service-id-name

API: added ability to save usages by service name or id (instead of unused symbol)
Merge branch 'develop' into feature/gui

Conflicts:
	src/ralph_scrooge/rest/menu.py
	src/ralph_scrooge/rest/urls.py
	src/ralph_scrooge/templates/ralph_scrooge/index.html