Revamp legislator screen, remove some unused code

[konklone]

This gets rid of the unpleasantly empty legislator profile screen, and compacts the legislator data to move it above the pager.

• Removes social media buttons - they were hard to place, and analytics shows they are very rarely used.
• Removes Committees button, replacing it with a Committees tab in the pager.
• Moves the Web button into the popup menu for the legislator page.
• Moves the Call button to be a visual button, next to the profile data.
• Sets the legislator's avatar to replace the title icon (and adds a utils method for doing that).
• Removes PopupMenuWrapper, not needed anymore for post-Honeycomb devices.

Screenshot: