ui: change person default icon

This commit introduces adjustements in lists layout.
In SmartList
- use custom Ring default user icon

In PersonsList
- use custom Ring default user icon
- make categories selectable
- remove background color of categories

In HistoryList
- add photo/default Ring user icon to history entries

Tuleap: #151
Change-Id: I99bba6ef95b31f9f6ac33d14f434c0a0bd53c654