Fixed implicit conversion to NULL warnings
added convert_to_matrix method in SGVector
fixed some crashes in sparse features unit tests
Merge pull request #1271 from gsomix/feature/linereader

SGVector: convert_to_matrix method
fix c++11 compile error
fixed a memory issue related to uninitialised memory which should be NULL
changed sparse matrix parameter registering
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
fixed many more unit test segfaults and non-passes. Mostly uninitialised memory, wrong get_name, wrong generic type
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
fixed generics to pass unit-tests
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
Merge pull request #1279 from karlnapf/develop

more bugfixes
Revert "fixed uninitialised memory bugs"

This reverts commit ab0d3977de71d7f031dfc8026580c7e7a39707df.