This project was a part of GSoC 2014. You could know more from following links:
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Project Description: http://wiki.apertium.org/wiki/User:Pankajksharma/Patcher
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Installation Directions: http://wiki.apertium.org/wiki/User:Pankajksharma/Patcher_Installation
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API usage and algorithm used: http://wiki.apertium.org/wiki/User:Pankajksharma/Patcher
If you face any issue, contact 'sharmapankaj1992 (at) gmail (dot) com'