Multiple UX changes
* Added padding to tweets in ListView
* Changed link color in tweets to meet the colors given by the theme
* Using Formatting for the time-label in tweets
* Changed background of the tab bar to one with more contrast
* Use icons from theme for tabs and highlight icon of selected tab
* Changed height of tab bar
* Changed unread-counters on tabs to bubbles
* Changed sideRectColor of tweets to meet the colors given by the theme
* Added ContactHeader to display a header on a users page that looks and feels like the one on Jollas People app