Replaced std::tuple with std_cxx11::tuple
Fixed std_cxx11 also in the tests.
comments added to step-54
more comments added to step-54. and docs
removed some files
some improvements to step-54 comments, intro and results
some more improvements to step-54 comments, intro and results
pictures path in html files of step-54 is now changed to its final location (pictures will need to be uploaded on the deal website)
new test for NormalToMeshProjectionBoundary added
Fixed indentation.
Merge pull request #5 from andreamola/step-54PR2

Step 54 pr2 from @andreamola