Update Twig/DataGridExtension.php

getGridUrl can now return an export Url.
Fix #321
JMSTranslationBundle translation extractor for column titles
Ignore accents when using like filters with Vector
Update Resources/translations/messages.ru.xliff
Merge pull request #326 from ip512/patch-2

Ignore accents when using eq/like filters with Vector
Fixing notice while setting default filters
Changing from array_key_exists to isset, value can't be null
Merge pull request #331 from piotrass/Issue#330

Fixing notice while setting default filters without from input
Update Grid/Source/Source.php

Prevents "Notice: Undefined index"
Update Grid/Source/Vector.php

Prevents "Notice: Undefined index"
Update Grid/Source/Vector.php
Update Grid/Source/Source.php
Update DependencyInjection/Configuration.php

- remove duplicate line.
- do not perform a deep merge with limit configuration node (limit can now have specific values in dev configuration and a second one in prod configuration).
Update licence
Fix searchOnClick with ajax
Fix selectMulti search with ajax
Update Resources/views/blocks_js.jquery.html.twig
Fix isNull filter auto submit in search box.
Fix previous commit