fix contactable image
change formatted date, now it supports 'fromNow' format
extended suscription of conversations
change Util.getUserInformation: if user not found returns null - if not picture returns '/assets/user-photo-placeholder.jpg'
migrate header to blaze to fix several things (the sidebar remains using ko)
type error in conversations
fix getUserInfo's picture
fix unread messages's style
Merge branch 'devel' of github.com:Exartu/Exartu-CRM into devel

Conflicts:
	client/views/contactables/detail/contactable.html