Add presentations.

Presentations/Accept No Visitors/README.md

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+# Accept No Visitors
+
+Actually presented power-point slides are available on GitHub: http://bit.ly/AcceptNoVisitors
+
+The larger Mach7 project can be found at https://github.com/solodon4/Mach7.
+
+The two files discussed in the talk are: https://github.com/solodon4/Mach7/blob/master/code/cppcon-visitors.cpp (implementation with visitors) and https://github.com/solodon4/Mach7/blob/master/code/cppcon-matching.cpp (implementation with pattern matching).

Presentations/Using C++ to Connect to Web Services/README.md

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+# Using C++ to Connect to Web Services
+
+Slides and demo applications can be found at:
+
+https://github.com/stgates/webservicescppcon2014