First stab at arrowhead refactoring

Yea, 
This was a refactoring that I want the whole way with.  I know I could have extracted the methods in question, but I honestly did not like the nested hash.  Needless to say, I did a little more work, but you be the judge.

Also, reference the arrowhead.rb file as well.  It essentially became a domain object for storing the data.

Thanks!
The indentation here is wrong. The `rescue` clause should be parallel with the def, not indented under the filter. Naturally the following line should be adjusted accordingly.