Try the GNU extensions first when determining C++11 flags
Move cxx11 tests to after the place where the METHODS are set.
Try compiling cxx11 shared_ptr code with multiple methods.
Don't pass -ansi to GCC in DEBUG mode, it implies -std=c++98
Ran bootstrap.
Merge pull request #306 from libMesh/cxx11

Don't blindly pass -ansi to GCC in DEBUG mode