Added option 'position' to the filters

Added the option 'position' for the filters.
I ran into problems with some of the tests. To be more precise, there are 3 tests that fail (they failed before this change). 2 of them fail because of some hidden inputs that should be generated, and the other (where I needed to put the test for this new functionality) fails with the error:
 undefined method `protect_against_forgery?' for #<ActionView::Base:0x0000000553d0b8>

I did't know how exactly to include the RequestForgeryProtection module into the tests (or maybe stub it or something).