Better check for model instances in CheckRedirect
Better check for model instances in CheckRedirect

to avoid some false positives when redirecting to a model instance.
Should fix #96

liqites/brakeman,dfens/brakeman,jakeatwork/brakeman,bf4/brakeman,lee-leon/brakeman,masarakki/brakeman,bf4/brakeman,htdc/brakeman,jlecour/brakeman,jeffyip/brakeman,jlecour/brakeman,jlecour/brakeman,codeclimate/brakeman-deprecated,lee-leon/brakeman,kbrock/brakeman,masarakki/brakeman,cheerfulstoic/brakeman,spcoder/brakeman,oreoshake/brakeman,dfens/brakeman,htdc/brakeman,masarakki/brakeman,oreoshake/brakeman,codeclimate/brakeman-deprecated,dfens/brakeman,spcoder/brakeman,liqites/brakeman,cheerfulstoic/brakeman,kbrock/brakeman,github/brakeman,liqites/brakeman,bf4/brakeman,jakeatwork/brakeman,spcoder/brakeman,htdc/brakeman,jeffyip/brakeman,kbrock/brakeman,github/brakeman,cheerfulstoic/brakeman,jakeatwork/brakeman,lee-leon/brakeman