Issue #100 remove auto_ptr and c++03 support.

Problem:
auto_ptr is deprecated.

Solution:
use unique_ptr which is only available in c++11 and newer.
Also fix how unit tests are run as part of the build to keep them from being
deleted when they fail.

Testing:
Unit tests on linux run.

libuavcan/test/protocol/dynamic_node_id_server/node_discoverer.cpp

@@ -3,8 +3,6 @@
  */
 
 #if __GNUC__
-// We need auto_ptr for compatibility reasons
-# pragma GCC diagnostic ignored "-Wdeprecated-declarations"
 # pragma GCC diagnostic ignored "-Wzero-as-null-pointer-constant"
 #endif