PIM-2245 Do not wait for page loading when executing job

As the job execution page contains ajax calls and the wait() method is
waiting for page ajax request to finish (!$active), it can wait
infinitely (or at least more than 10 seconds which is the upperbound
before crashing).
PIM-2245 Prevented querying the attribute table from the product repository

It breaks the Single Responsibility Principle
PIM-2245 Ensured Metric and Price string format

ODM casts them into double which drops decimals when casting into string
PIM-2245 Manipulate prices in transformer through product builder
PIM-2245 Regex power (and heavyness) is not required here
PIM-2245 Added missing method in the product builder
Merge branch 'master' into mongodb/import-product

Conflicts:
	src/Pim/Bundle/CatalogBundle/Doctrine/MongoDBODM/ProductRepository.php
	src/Pim/Bundle/CatalogBundle/Manager/ProductManager.php
	src/Pim/Bundle/CatalogBundle/Model/ProductValue.php
PIM-2245 Removed identifier injection in the mongodb product repository
Merge branch 'master' into mongodb/import-product
Merge pull request #937 from akeneo/mongodb/import-product

PIM-2245 Adapted product import for Mongo