Very initial implementation of Date Header (#82)

Signed-off-by: Andrea Cappelli <a.cappelli87@gmail.com>
Added style to date textview

Signed-off-by: Andrea Cappelli <a.cappelli87@gmail.com>
Merge branch 'master' into date_stamp
Merge branch 'master' into date_stamp
Merge branch 'master' into date_stamp
Fix date label and tablet layout

Signed-off-by: Andrea Cappelli <a.cappelli87@gmail.com>
Fix timestamp inside balloon and uppercase date

Signed-off-by: Andrea Cappelli <a.cappelli87@gmail.com>