add data service for charity search

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The IRS publishes a list of all non-profit charities that file taxes in Publication 78. You can download a list of all the charities in a single file every quarter.

To download: http://www.irs.gov/charities/article/0,,id=96136,00.html Explains what publication 78 is: http://www.irs.gov/irm/part25/irm_25-007-006.html