Prevent from recompiling, export *.so libraries
Circular dependency to dependency_tracker fixed
Explicit list of *.so libraries in CMakeLists
Added protobuf generation export

* Needed to use own protobuf generator instead of default system one
WIP on fixing problem with double linkage of gflags/glog
Modified CMakeLists to reflect other packages convention
Merge pull request #3 from ethz-asl/fix/glog_gtest_fixing

Fix/glog gtest fixing