Handle data from char device on stdin

Fixes #96

common/fileutil/fileutil.go

@@ -18,13 +18,14 @@ func FolderExists(folderpath string) bool {
 }
 
 // HasStdin determines if the user has piped input
-func HasStdin() bool {
-	fi, err := os.Stdin.Stat()
+func hasStdin() bool {
+	stat, err := os.Stdin.Stat()
 	if err != nil {
 		return false
 	}
-	if fi.Mode()&os.ModeNamedPipe == 0 {
-		return false
-	}
-	return true
+
+	isPipedFromChrDev := (stat.Mode() & os.ModeCharDevice) == 0
+	isPipedFromFIFO := (stat.Mode() & os.ModeNamedPipe) != 0
+
+	return isPipedFromChrDev || isPipedFromFIFO
 }