Parse*: explicitly spell out kParseDefaultFlags

Instead of hard-coding the value 0 for the parseFlags in the
various parsing overloads, explicitly use kParseDefaultFlags
to provide more self-documenting code.

include/rapidjson/document.h

@@ -1004,7 +1004,7 @@ public:
 
 	template <typename InputStream>
 	GenericDocument& ParseStream(InputStream& is) {
-		return ParseStream<0, Encoding, InputStream>(is);
+		return ParseStream<kParseDefaultFlags, Encoding, InputStream>(is);
 	}
 
 	//! Parse JSON text from a mutable string.
@@ -1024,7 +1024,7 @@ public:
 	}
 
 	GenericDocument& ParseInsitu(Ch* str) {
-		return ParseInsitu<0, Encoding>(str);
+		return ParseInsitu<kParseDefaultFlags, Encoding>(str);
 	}
 
 	//! Parse JSON text from a read-only string.
@@ -1044,7 +1044,7 @@ public:
 	}
 
 	GenericDocument& Parse(const Ch* str) {
-		return Parse<0>(str);
+		return Parse<kParseDefaultFlags>(str);
 	}
 
 	//! Whether a parse error was occured in the last parsing.

include/rapidjson/reader.h

@@ -323,7 +323,7 @@ public:
 
 	template <typename InputStream, typename Handler>
 	bool Parse(InputStream& is, Handler& handler) {
-		return Parse<0>(is, handler);
+		return Parse<kParseDefaultFlags>(is, handler);
 	}
 
 	bool HasParseError() const { return parseErrorCode_ != kParseErrorNone; }