update spanish translations
Merge pull request #530 from nclsHart/spanish-translations

Fix #492 update spanish translations
Added czech translation file
Merge pull request #532 from ufik/czechTranslation

Added czech translation file
Update set_permanent_filters.md
Update PHPExcel_installation.md
Makes the Vector class able to ready PHP DataTime objects. It's very hand when it's comming from a Doctrine query
Merge pull request #536 from medinadato/master

Makes the Vector class able to ready PHP DataTime objects. It's very han...
Fix html input type url
Update vector_source.md
Add hasColumn method to Grid in order to check if a column exists in both 'columns' and 'lazyAddColumn' properties before processLazyParameters is called
Merge pull request #549 from cyrilbarragan/master

Add hasColumn method to Grid in order to check if a column exists in bot...
Update README.md
Strange count query #553 fix
Add rank column + docs
Fix doc
Merge pull request #554 from WARrior-Alex/master

Fix count query
Fix use section
Merge pull request #556 from WARrior-Alex/master

Fix use section
fix ambiguous Twig block naming

https://github.com/Abhoryo/APYDataGridBundle/issues/550