Adding McKayla, GoT, Morpheus, and Bear Grylls

#   hubot memegen <text> NOT IMPRESSED - Generates McKayla Maroney
#   hubot memegen PREPARE YOURSELF <text> - Generates GoT
#   hubot memegen WHAT IF I TOLD YOU <text> - Generates Morpheus
#   hubot memegen <text> BETTER DRINK MY OWN PISS - Generates Bear Grylls
Merge pull request #950 from sherl0k/patch-1

Adding McKayla, GoT, Morpheus, and Bear Grylls