force check for -is-interface-pp when using stdin (#357)
force check for -is-interface-pp when using stdin (#357)

* force check for -is-interface-pp when using stdin

* disallow binary_reason files from skipping -is-interface-pp check

cristianoc/reason,cristianoc/reason,ak3n/reason,yunxing/reason,ak3n/reason,yunxing/reason,cristianoc/reason,yunxing/reason,ak3n/reason,chenglou/reason,let-def/reason,let-def/reason,let-def/reason,facebook/reason,facebook/reason,chenglou/reason,chenglou/reason,yunxing/reason,ak3n/reason,facebook/reason