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.

README.md

@@ -88,7 +88,7 @@ make -j8
 ## Library development
 
 Despite the fact that the library itself can be used on virtually any platform that has a standard-compliant
-C++03 or C++11 compiler, the library development process assumes that the host OS is Linux.
+C++11 compiler, the library development process assumes that the host OS is Linux.
 
 Prerequisites:
 
@@ -102,7 +102,8 @@ Building the debug version and running the unit tests:
 mkdir build
 cd build
 cmake .. -DCMAKE_BUILD_TYPE=Debug
-make
+make -j8
+make ARGS=-VV test
 ```
 
 Test outputs can be found in the build directory under `libuavcan`.