update taxon permalink generation

using gedmo TreeSlugHandler
Remove parent/children taxon definition

It is now defined in TaxonomiesBundle
Allow slashes in url
Merge pull request #990 from lbaey/master

Handle taxon permalink generation
Updated calculate functions to be fluent and added specs
Merge pull request #992 from elliot/orderitem_fluent_calculation

Updated calculate functions to be fluent and added specs
Manage inventory UI
Merge pull request #971 from umpirsky/feature/manage-inventory-ui

Manage inventory UI
Add overflow ellipsis to the backend sidebar
Merge pull request #994 from edwines/master

Add overflow ellipsis to the backend sidebar
Removed unnecessary "I" from steps
Inventory level events
Merge pull request #998 from umpirsky/feature/inventory-level-events

Inventory level events
Merge pull request #997 from tompedals/patch-1

Removed unnecessary "I" from steps
Make height of backend signin form automatical
Explicit exception
Change method to protected
Merge pull request #1005 from winzou/resource-ex

Explicit exception
Merge pull request #1007 from winzou/fix/listener

Change method to protected
Merge pull request #1001 from Im0rtality/patch-1

Make height of backend signin form automatical