Move `Request#[]` and `Request#[]=` to `Helpers` and deprecate them
Move `Request#[]` and `Request#[]=` to `Helpers` and deprecate them

gfvcastro/rack,wjordan/rack,wjordan/rack,imtayadeway/rack,gfvcastro/rack,gfvcastro/rack,wjordan/rack,imtayadeway/rack,imtayadeway/rack