Bug fix in arguments checking
Merge branch 'master' of git://github.com/CeON/CoAnSys
Merge branch 'master' of git://github.com/CeON/CoAnSys
Merge branch 'master' of git://github.com/CeON/CoAnSys
Added pig UDFs moved from coansys-io, removed dependency of coansys-io
Corrected license info
Merge pull request #152 from acz-icm/master

UDFs moved from coansys-io
Merge branch 'master' of git://github.com/CeON/CoAnSys
differences in features per record - exhaustive, aproximate, test cases
extract contrib given data UDF: parametr for skipping empty features