added EigenSparseUtil class
added EigenSparseUtil class
Merge branch 'feature/eigen_sparse_util' into develop
Merge pull request #982 from lambday/develop

Added EigenSparseUtil class for ease of coverting SGSparseMatrix to Eigen3 SparseMatrix
Add gdb package for debugging errors in examples
Add r,java,rubycsharp,lua modular interfaces to travis
Add python-scipy package to python_modular on travis