avoid long lines

It is a coding style violation.
Form type : sonata_choice_field_mask

Copied from SonataDoctrinePhpcrAdminBundle
This widget allow to hide/display other fields in a form when a value in a select widget  is selected.
sonata_type_choice_field_mask_widget : javascript change

- Hide all fields if no item is selected
- Use jQuery instead of $
log exceptions

Don't just throw away the useful error messages!
add if_true/if_false method in FormMapper
add tree layout elements
move branch alias to 2.4
Merge branch '2.3'

Conflicts:
	Mapper/BaseGroupedMapper.php
Merge pull request #2408 from greg0ire/log_exceptions

[DX]Log exceptions
Updated Date*RangeType filter options
Merge pull request #2422 from Bladrak/fieldoptions_daterange

Updated Date*RangeType filter options
fix treeview loader
Merge pull request #2410 from jerome-fix/ChoiceFieldMaskType

Form type : sonata_choice_field_mask
Added info to changelog about new form type
initial work to support mozaic view mode
Add filters on top
remove the add action from view
add documentation for mozaic, update default pager value
fix unit tests
fix image reference