Add escape functionality to rjp++

rjp++/include/string.hpp

@@ -47,6 +47,9 @@ namespace rjp{
 		string& operator=(RJP_value* r);
 	};
 
+	string escape(const rexy::string_base& str);
+	string escape(const char* c);
+
 }
 
 #endif

rjp++/src/string.cpp

@@ -46,4 +46,12 @@ namespace rjp{
 		str->length = 0;
 		return *this;
 	}
+
+	string escape(const rexy::string_base& str){
+		return escape(str.c_str());
+	}
+	string escape(const char* c){
+		RJP_string tmp = rjp_escape(c);
+		return string(rexy::steal<char*>(tmp.value), tmp.length);
+	}
 }