Introduce Smt::Connection wrapping up the database connection.
Do not build static library.
Link to boost/system explicitly

Addressing:
Linking CXX executable test_first
/bin/ld: CMakeFiles/test_first.dir/test_first.cpp.o: undefined reference to symbol '_ZN5boost6system15system_categoryEv'
/bin/ld: note: '_ZN5boost6system15system_categoryEv' is defined in DSO /lib64/libboost_system-mt.so.1.53.0 so try adding it to the linker command line
/lib64/libboost_system-mt.so.1.53.0: could not read symbols: Invalid operation
collect2: error: ld returned 1 exit status
make[2]: *** [tests/test_first] Error 1
make[1]: *** [tests/CMakeFiles/test_first.dir/all] Error 2
make: *** [all] Error 2