rails/arel — pull request #119 by frodsan (2012-05-03 02:22:46+00:00)
Title: removing arel/relation from gemspec

Avoid:

```
Using arel (3.0.2.20120221150532) from git://github.com/rails/arel.git (at master)
arel at /Users/frodsan/.rbenv/versions/1.9.3-p194/lib/ruby/gems/1.9.1/bundler/gems/arel-7373e81ae7f9 did not have a valid gemspec.
This prevents bundler from installing bins or native extensions, but that may not affect its functionality.
The validation message from Rubygems was:
["lib/arel/relation.rb"] are not files
```