added FFDiag AJD algorithm and a unit test.
rational approximation unit-test added
Merge pull request #1212 from lambday/feature/log_determinant

rational approximation unit-test added
Merge pull request #1211 from pickle27/develop

added FFDiag AJD algorithm and a unit test.
added CircularBuffer and LineReader
don't fail bsd bot when json is not available
Merge pull request #1130 from gsomix/feature/getline

LineReader class for reading lines from file stream
performance test of sparse-matrix vector product added