Removing without_thor_debug

a1d0c0fa3d8ca97edc8f2a1d6ba96af19221dbad

as bundler 1.5.2 is out now
Merge pull request #13671 from arunagw/upgrade-bundler

Removing without_thor_debug
Fix iterating over DateTime by doing strict checking for Time objects

- Fixes #13667
Merge pull request #13668 from prathamesh-sonpatki/issue-13667

Fix iterating over DateTime by doing strict checking for Time objects
fixes the Gemfile generator templates

The templates were written as if for a given gem you could either pass a version
or options, but not both. But you may want to specify a version and also a group
or whether the gem has to be required, for example.
upgrade SDoc

Kudos to @zzak for taking over SDoc and make it work with RDoc 4.
fixes a typo in a CHANGELOG