Cleanup layout's HTML
Improved error messages and unit tests in BaseGroupedMapper, fixed CS

Fixed tests for php 5.3
Merge pull request #2412 from dunglas/patch-3

Cleanup layout's HTML
Merge pull request #2411 from pulzarraider/base_group_mapper_impr

Improved error messages and unit tests in BaseGroupedMapper, fixed CS
add catalan & spanish no javascript warning message translation
Merge pull request #2418 from davidromani/master

add catalan & spanish no javascript warning message translation
add catalan & spanish no fields available message translation
Merge pull request #2420 from davidromani/master

add catalan & spanish no fields available message translation
Implement html field type

Currently, there is no way to display safe html in a sonata list