[gtksourceview] (13 commits) ...Merge branch 'css-comments' into 'master'

[Christian Hergert <chergert src gnome org>]

Summary of changes:

  b09058c... css.lang: Fix highlighting for dangling close comment
  c3f53aa... css.lang: Allow comments inside ratio values
  bd3b60a... css.lang: Allow comments inside An+B expressions
  dcff4fc... css.lang: Allow comments before attribute name in attribute
  b0042e4... css.lang (and family): Allow comments inside pseudo-element
  dc38a2c... css.lang: Remove end-parent="true" from modifiers context
  d2359ef... css.lang: Handle escapes in unquoted strings/identifiers
  7e750e2... css.lang (and family): Update/cleanup regular expressions
  4f34917... scss.lang: Allow interpolations in scss-url context
  03ed54d... scss.lang: Improve declaration value detection
  0a2b10e... less.lang: Use own identifier regex
  153bbf4... less.lang: Improve declaration value detection
  9a574c4... Merge branch 'css-comments' into 'master'