[gnome-calendar] (18 commits) Non-fast-forward update to branch mcatanzaro/webcal

[Michael Catanzaro <mcatanzaro src gnome org>]

The branch 'mcatanzaro/webcal' 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:

  4990adc... source-discoverer: add support for webcal:// URIs

Commits added to the branch:

  2bf6cfe... Avoid critical on startup when a calendar is broken (*)
  ca04f15... Update Slovak translation (*)
  eedbfdc... Update Dutch translation (*)
  6091a14... Updated Slovenian translation (*)
  dbfebc8... Introduce GcalRange (*)
  d9733ae... event: Simplify some code (*)
  0935a67... event: Add helper API to return a GcalRange (*)
  923e3b7... project: Move range tree to core/ (*)
  b97c4a2... range-tree: Cleanup header (*)
  3efbc24... range-tree: Use GcalRange (*)
  bed8e10... range-tree: Add print utility (*)
  12fd607... utils: Make date comparison follow time comparison semantic (*)
  f3c3bbf... event: Use GcalRange in public API (*)
  16c1569... calendar-monitor: Use GcalRange (*)
  d4a6cd0... timeline: Process events in batches (*)
  fd32492... timeline, calendar-monitor: Remove useless event range chec (*)
  98e6ac2... event: Remove unused method (*)
  a9f8cd4... source-discoverer: add support for webcal:// URIs

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