image suffix and orientation - 2 issues

[bikedel]

Hello

I like what you have done. Thank you.

1. navigation buttons will not work with images that have a capital suffix

fileio.go LINE 77
if strings.HasSuffix(v, ".png") || strings.HasSuffix(v, ".jpg") || strings.HasSuffix(v, ".jpeg") ||

**** I have it working by checking lowercase suffix as below

if strings.HasSuffix(strings.ToLower(v), ".png") || strings.HasSuffix(strings.ToLower(v), ".jpg") || strings.HasSuffix(strings.ToLower(v), ".jpeg") || strings.HasSuffix(strings.ToLower(v), ".gif") {

2. image orientation is not correct when viewing portrait images taken with my DSLR

**** I have it working by adding an import and changing one line of code

fileio.go
import "github.com/disintegration/imageorient"
and changed line 67 to
a.img.OriginalImage, _, err = imageorient.Decode(file)