Restore source credentials from Gemfile
Verify source sorting
Version 1.6.6 with changelog
Verify source sorting
Sort sources in lock the same as in 1.6
Friendly error on ENOSPC

fixes #3153
Version 1.7.2 with changelog
skip YAML::ENGINE specs when it is removed
suppress default_external= warning
Merge tag 'v1.6.6'

Version 1.6.6

Conflicts:
	CHANGELOG.md
	lib/bundler/version.rb
Merge tag 'v1.7.2'

Version 1.7.2

Conflicts:
	CHANGELOG.md
	lib/bundler/source_list.rb
	spec/bundler/source_list_spec.rb