Fix compile warning with -Wshadow

include/yaml-cpp/emitterstyle.h

@@ -8,7 +8,7 @@
 #endif
 
 namespace YAML {
-struct EmitterStyle {
+namespace EmitterStyle {
 enum value { Default, Block, Flow };
 };
 }

include/yaml-cpp/node/type.h

@@ -8,7 +8,7 @@
 #endif
 
 namespace YAML {
-struct NodeType {
+namespace NodeType {
 enum value { Undefined, Null, Scalar, Sequence, Map };
 };
 }

src/singledocparser.cpp

@@ -1,4 +1,3 @@
-#include <algorithm>
 #include <cstdio>
 #include <sstream>