Add API reference tools to Gemfile
Add API reference tools to Gemfile

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