Add Amahi entry

Hi, here is the entry for Amahi (issue #25).

Edit: removed the comments below -- and made a new commit to clarify what's needed to run locally properly. a rake task exists to pull the github data and put it in a data file.

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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.