README update
README update

 * Do not use multiple h1 headers per page
 * The majority of README readers come from GitHub so use GitHub's Ruby code highlighting feature
 * Minor copy edits

pressrelations/bunny,jafrog/bunny,wconrad/bunny,jafrog/bunny,pressrelations/bunny,gferguson-gd/bunny,bartj3/bunny,wconrad/bunny,teodor-pripoae/bunny,teodor-pripoae/bunny,0xfaded/bunny,0xfaded/bunny,bartj3/bunny,gferguson-gd/bunny