WebKitGTK+ 2.17.3 released!

This is a development release leading toward 2.18 series.

Add new API to create a WebKitContextMenuItem from a GAction.
Fix graphics repaint hungs in accelerated compositing mode after a resize.
Fix rendering glitches in HiDPI in long GitHub Gist pages when focusing the comments textarea.
Remove Firefox user agent quirk for Google domains.
Remove LATEST_RECORD_VERSION from GnuTLS priority string.
Improve colors of inspector SVG icons.
Fix several crashes and rendering issues.
Translation updates: French.

Thanks to all the contributors who made possible this release.