vCard: send compressed avatar
vCard: send compressed avatar

- load only files in PNG or JPEG format
- if image loading failed skip sending image

Change-Id: I61fe83b8f16bb942a76cd14eb55e1ad1cb10ac17

savoirfairelinux/ring-lrc,savoirfairelinux/ring-lrc,savoirfairelinux/ring-lrc,savoirfairelinux/ring-lrc,savoirfairelinux/ring-lrc