bundler/bundler — pull request #3199 by danfinnie (2014-10-04 05:31:43+00:00)
Title: Add warning message when Gemfiles use source with a block.

This fixes issue #3198.

When a user has a Gemfile such as:
```ruby
source 'http://example.com` do
gem 'nokogiri'
end
```

This prints a warning, as this form of `source` is not supported in Bundlers <1.7.