Merge branch 'develop'

* develop: (55 commits)
  Added optional parameters start and end date for the account getSum function
  - Documented the Entities functions - Removed the fixture hardcoded data
  Changed the vaiables from protected to private
  Fixed getBalance function to left join ElcwebAccountingBundle:Transaction
  Remove left join that use external library
  - Fixed the getBalance to use the transaction "date" rather than the Entry createdAt date.
  ELEN-170 - Implemented date filtering in the accounting Entry sum - Added date column to accounts - Fixed a bug with non existing account parent - Fixed some tables classes
  Take in consideration the account type for displaying entries
  When create account with the manager, get the parent account type
  Add number_format
  AccountRepository should extend NestedTreeRepository
  - Added EntryRepository with getBalance function that is working without the time filtering for now
  - Added EntryController and its index view
  - Added parent slug so we know where we are - Added total sum
  Permit entity clone
  Remove unused function
  Add Serializer fields exposure
  Permit Doctrine Inheritance
  Balance and sum with children
  Create first Event listener
  ...
Update documentation