Add Amahi entry

Hi, here is the entry for Amahi (issue #25).

I cannot seem to run opensourcerails locally with middleman because it raises 

  undefined method `github' for #<Middleman::CoreExtensions::Data::DataStore:0x007f838b5341f0>

from lib/project_helpers.rb#github_data() (i removed the rescue). I am trying to debug that at the moment. Seems like a mismatch in the way the data structure is being fetched.