Added permit_params dsl
Pass permit_params block to params.permit
Added newlines
allow svg icons to be resized
Merge pull request #2676 from igorbernstein/2621-resizable-svg-icons

allow svg icons to be resized
Updated documentation.

[ci skip]
Merge pull request #2635 from ball-hayden/2594-strong-parameters-dsl

Added permit_params dsl
add modal dialog & dynamic form to Batch Actions

thanks to @chrise86 for the updated CSS so this isn't horribly ugly