Merge pull request #8 from rjanja/mtwebster-settings

Use buttonboxes to correct padding when button images are turned off
Remove non-3.4 compatible properties from xlet-settings glade file
Always show applet/desklet/extension metadata icon on the back button
Add key name to changed:: callback data
Fix potential error when coming from get-more tab
Don't catch every changed signal
Check for changes done hint
Use custom file picker dialog instead of GtkFileChooserButton (it's buggy)
Remove no longer used method