Fixed implicit conversion to NULL warnings
added convert_to_matrix method in SGVector
Merge pull request #1271 from gsomix/feature/linereader

SGVector: convert_to_matrix method
fix c++11 compile error
Merge pull request #1274 from karlnapf/develop

Fix segfaults in unit tests
Merge pull request #1272 from van51/develop

Fixed travis warnings for implicit conversion from NULL to bool
add CSGObject as supported serialization PT
Merge pull request #1276 from karlnapf/develop

fixed many more unit test segfaults and non-passes.
cg_m added, template structure changed for linear solver
Merge pull request #1277 from karlnapf/develop

fixed generics to pass unit-tests
Merge pull request #1278 from lambday/feature/log_determinant

cg_m added, template structure changed for linear solver
fixed an uninitialised memory issue
fixed an uninitialised memory error