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/node/test_node.hpp

@@ -5,8 +5,6 @@
 #pragma once
 
 #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
 
@@ -217,7 +215,7 @@ struct TestNetwork
         { }
     };
 
-    std::auto_ptr<NodeEnvironment> nodes[NumNodes];
+    std::unique_ptr<NodeEnvironment> nodes[NumNodes];
 
     TestNetwork(uavcan::uint8_t first_node_id = 1)
     {