Remove inversedBy relation between Attribute and AttributeValue

Fix issue #1480 and #1372
Adding some minor adjustments
Fixed multiple sorting in Doctrine ORM EntityRepository

QueryBuilder's orderBy method replaces any previously specified orderings, addOrderBy must be used to append more than one.
Merge pull request #1843 from hmlb/patch-1

Fixed multiple sorting in Doctrine ORM EntityRepository
Fix 1834
Typo in specs
Merge pull request #1848 from umpirsky/fix/typo-23-08-2014

Typo in specs
Merge pull request #1847 from aRn0D/fix/1834

Fix 1834
Merge pull request #1482 from BenoitLeveque/fix-doctrine-mapping-on-attribute-value

Add missing relation between Attribute and AttributeValue
Added setters for ResourceEvent's message properties

The ResourceManager's behavior is to dispatch several ResourceEvents upon modifications of a resource (domain object).
Adding those setters permits to domain events listeners to dynamically change the messages properties that will eventually be used to generate a FlashBag or a log of some sort without the need to rewrite the DomainManager.
Merge pull request #1839 from aRn0D/bundle/config

Adding some minor adjustments
[CurrencyBundle] Add command to allow updating exchange rates using external databases
Allow to revert changes for versioned (loggable) resources
Retrieve forward/display route from Process object
Merge pull request #1863 from kayue/patch/forward-route

Retrieve forward/display route from Process object.
Merge pull request #1831 from stloyd/feature/currency_command

[CurrencyBundle] Add command to allow updating exchange rates using ECB database
Merge pull request #1860 from stloyd/feature/revert_entity_changes

Allow to revert changes for versioned (loggable) resources
Merge pull request #1859 from hmlb/patch-1

Added setters for ResourceEvent's message properties
Add missing Volume Based Pricing Configuration.
Fix wrong icon tag.