Mutant rabbit bite now does pierce, like the rest.

All the other bites do pierce, why leave out the rabbits?
Add glyph for MRs, add Red MRs

Mutant rabbit was missing a glyph, added a rare, harder rabbit.
Nerf damage by half.
Make 1 out of 1000
Merge pull request #16 from superninjakiwi/master

Adding Red mutant rabbits, mutant rabbit bite does pierce.