[cairo] user_data and get_reference_count APIs

[Vladimir Vukicevic]

Howdy,

Here's a patch that adds two sets of public APIs.

It adds user_data to the public objects that were missing them (cairo_t, cairo_pattern_t, cairo_scaled_font_t):

  cairo_get_user_data
  cairo_set_user_data

  cairo_scaled_font_get_user_data
  cairo_scaled_font_set_user_data

  cairo_pattern_get_user_data
  cairo_pattern_set_user_data

It also adds a get_reference_count method to all five of the public refcounted objects:

  cairo_get_reference_count
  cairo_surface_get_reference_count
  cairo_font_face_get_reference_count
  cairo_scaled_font_get_reference_count
  cairo_pattern_get_reference_count

How's this look?

    - Vlad
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