Don't expose RedCarpet to JRuby
Don't expose RedCarpet to JRuby

JRuby in 1.9 mode seems to freak out with JRuby. Let's not bother
exposing the gem dependency (which is only used for YARD).

Signed-off-by: Stephen Celis <06fa905d7f2aaced6dc72e9511c71a2a51e8aead@stephencelis.com>

SupportPay/recurly-ruby,SupportPay/RecurlyDemoNew,SupportPay/RecurlyDemoNew,SupportPay/recurly-ruby