stabilization of v0.1.53

Hello all, *Release of Content version 0.1.53 is scheduled for November 13th*, so I've created a stabilization branch for it. Now is a good time to hunt for bugs and propose fixes for them. Starting today, merged Pull Requests should be assigned to milestone v0.1.54. Bug fixes should be proposed to master and labeled "bugfix", they will be cherry-picked to the stabilization branch. The next release 0.1.54 will happen on January 22nd. Stabilization phase will start on January 11th. Best regards,