Warning when using pry

[bbatsov]

When I use pry as the backenf for inf-ruby I get a warning after each command:

pry(main)> 'hello'
'hello'
WARNING: terminal is not fully functional
-  (press RETURN)
=> "hello"

[dgutov]

Here's what I do:

(setenv "PAGER" (executable-find "cat"))

Not sure if it's necessarily the right solution, or how to best document it.