Bump version to 0.1.18. Includes new functions cairo_current_path, cairo_current_path_flat, cairo_surface_get_filter. Support for XCB backend. Fixes for building in cygwin. Adds cairo_surface_get_filter.
Add new path query functions.
Implement support for cairo_current_path and cairo_current_path_flat. These functions just provide an interface to _cairo_path_interpret and take care of mapping from device space back to user space.