Merge pull request #1099 from asmaloney/warning_fixes

Fixes two type warnings and a missing case option

code/AssxmlExporter.cpp

@@ -72,7 +72,7 @@ static int ioprintf( IOStream * io, const char *format, ... ) {
         return -1;
     }
 
-    static const size_t Size = 4096;
+    static const int Size = 4096;
     char sz[ Size ];
     ::memset( sz, '\0', Size );
     va_list va;

code/ColladaExporter.cpp

@@ -384,6 +384,7 @@ void ColladaExporter::WriteLight(size_t pIndex){
         case aiLightSource_SPOT:
             WriteSpotLight(light);
             break;
+        case aiLightSource_AREA:
         case aiLightSource_UNDEFINED:
         case _aiLightSource_Force32Bit:
             break;