Remove unnecessary 'class' keyword

includes/OISEffect.h

@@ -211,7 +211,7 @@ namespace OIS
 	public:
 		ConstantEffect() : level(5000) {}
 
-		class Envelope envelope; //Optional envolope
+		Envelope envelope; //Optional envolope
 		signed short level;       //-10K to +10k
 	};
 
@@ -224,7 +224,7 @@ namespace OIS
 	public:
 		RampEffect() : startLevel(0), endLevel(0) {}
 
-        class Envelope envelope; //Optional envelope
+        Envelope envelope; //Optional envelope
 		signed short startLevel;  //-10K to +10k
 		signed short endLevel;    //-10K to +10k
 	};
@@ -238,7 +238,7 @@ namespace OIS
 	public:
 		PeriodicEffect() : magnitude(0), offset(0), phase(0), period(0) {}
 
-		class Envelope envelope;  //Optional Envelope
+		Envelope envelope;  //Optional Envelope
 
 		unsigned short magnitude;  //0 to 10,0000
 		signed short   offset;