Fix path parsing mistaking 'E' as a command instead of an exponent

Source/Paths/SvgPathBuilder.cs

@@ -257,7 +257,7 @@ namespace Svg
             for (var i = 0; i < path.Length; i++)
             {
                 string command;
-                if (char.IsLetter(path[i]) && path[i] != 'e') //e is used in scientific notiation. but not svg path
+                if (char.IsLetter(path[i]) && path[i] != 'e' && path[i] != 'E') //e is used in scientific notiation. but not svg path
                 {
                     command = path.Substring(commandStart, i - commandStart).Trim();
                     commandStart = i;