Add a section about key-handler to the man page.
Timeout initial redraw
Fix build with giflib >= 5.1.0.
Use integers for mouse mappings and buttons 6+7 for horizontal scrolling

Fixes issue #143
Merge branch 'barthalion/master'
Use thumbnails in EXIF tags; requirement for libexif is back
Small fix for thumbnail cropping
Create thumbnail cache dir automatically
Show key handler status in bar while it is running
Merge remote-tracking branch 'upstream/master'