add datalea config parameters
remove variable unique option and add column unique option
fix coding style
fix json dump if PHP < 5.4.0
change default file prefix
Merge branch 'master' into integration

Conflicts:
	app/views/base.html.twig
	app/views/datalea/form/fields.html.twig
	app/views/datalea/generate.html.twig
	src/Spyrit/Datalea/Form/Type/ColumnConfigType.php
	src/Spyrit/Datalea/Form/Type/VariableConfigType.php
fix css