getting the following when running `gel install`: ``` ERROR: Failed to evaluate "/Users/jpowell/src/spree/Gemfile": undefined method 'eval_gemfile' for #<Gel::GemfileParser::ParseContext:0x00007f865c0da810> /Users/jpowell/src/spree/Gemfile:1:in `parse' ``` see: [eval_gemfile](https://github.com/rubygems/bundler/blob/838ca7241a6dd6136586d125d669e828bc969677/lib/bundler/dsl.rb#L41) on [Spree](https://github.com/spree/spree), which shares common dependencies across component engines: https://github.com/spree/spree/blob/756c8657a11291feb009bce901363963fa3b5d9d/Gemfile#L1 Is there a way to handle with gel?