[librsvg] (17 commits) Non-fast-forward update to branch wip/ignatenko/cssparser-0.24

[Federico Mena Quintero <federico src gnome org>]

The branch 'wip/ignatenko/cssparser-0.24' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  792d11b... deps: update cssparser to 0.24

Commits added to the branch:

  0826dba... Port feColorMatrix (*)
  e0a8538... Fix <image> bbox once again (*)
  cc367ed... Add parsers::integer{,-optional-integer}() (*)
  5dc0cda... Add the PixelRectangle iterator to surface_utils (*)
  c3e9bb6... Port feConvolveMatrix (*)
  f8d0308... Add unit tests for integer parsers (*)
  f34c011... Fix error message in convolve_matrix (*)
  fe08bb3... Fix alpha zero check in color_matrix (*)
  ca83a91... Change assert! to assert_eq! (*)
  9d5de12... Add IRect::scale() (*)
  ac22549... Add SharedImageSurface::scale{,_to}() (*)
  3408974... Refactor convolve_matrix to use the scale method (*)
  ed37e89... Rename affine to _affine in FilterContext (*)
  0e343e8... Remove unused line from image.rs (*)
  e72f109... Refactor FilterError and FilterContext::get_input() (*)
  e31247c... Merge branch 'YaLTeR/librsvg-filters-to-rust-7' (*)
  5794f0a... deps: update cssparser to 0.24

(*) This commit already existed in another branch; no separate mail sent