Use a custom vapi for now (copied from GNOME Contacts)

Also, avoid shadowing a variable

Almost a line-by-line translation of the original C code. Main
differences are:
  * _freeze() and _thaw() methods are removed (now useless as a spinner is
    used for the busy state
  * GObject properties are used throughout the code
  * contextual menu implemented with GMenu/GActions
  * slight rework of the subfolder tips code in RingsChart

Also make it private to the location list.

This is in preparation to use a titlebar

Encoding a RPATH is in general not a good idea [1].

[1] http://wiki.debian.org/RpathIssue

https://bugzilla.gnome.org/show_bug.cgi?id=701028

Mini-review of the stubs, tidy indenting, add markup, rename protocol
pages.

Mark email addresses as untranslatable.