start some NLP stuff

fix to typo in example_callback.cpp

examples/example_callback.cpp

@@ -37,7 +37,7 @@ int main(){
   Multiplier oMultiplier;
 
   //attach multiplier instance to oMultiply using .connect() method. This requires the class member to invoke and the instance to invoke it on
-  oMultiply.connect<Multiplier, &Multiplier::Multiply>(&oMultipler);
+  oMultiply.connect<Multiplier, &Multiplier::Multiply>(&oMultiplier);
 
   std::cout << "Calling oMultipler.Multiply(6,3) through oMultiply callback returns : " << oMultiply(6, 3) << std::endl;
   return 0;

include/xtd/nlp/bag_of_words.hpp

@@ -0,0 +1,16 @@
+/** @file
+histogram of words in a document
+@copyright David Mott (c) 2016. Distributed under the Boost Software License Version 1.0. See LICENSE.md or http://boost.org/LICENSE_1_0.txt for details.
+*/
+
+
+namespace xtd{
+  namespace nlp{
+    class bag_of_words : std::map<std::string, uint32_t>{
+    public:
+      explicit bag_of_words(const xtd::string& src){
+        auto sWords = src.split();
+      }
+    };
+  }
+}

include/xtd/nlp/nlp.hpp

@@ -1,4 +1,5 @@
 /** @file
-
+natural language processing
 @copyright David Mott (c) 2016. Distributed under the Boost Software License Version 1.0. See LICENSE.md or http://boost.org/LICENSE_1_0.txt for details.
 */
+

include/xtd/xtd.hpp.in

@@ -399,4 +399,6 @@ TODO("Remove cassert when XTD implementation is finished")
   #include <xtd/windows/dbghelp.hpp>
 #endif
 
+#include <xtd/nlp/nlp.hpp>
+
 #include <xtd/exception.inl>