Bundler seems to be installing gems that I don't need, and they are causing issues. Let's take two examples: `timers` and `celluloid`

`bundle install` is installing `timers` which is required by `celluloid` but I don't know why celluloid is being installed at all. I'm using ruby 1.8.7 and rails 3.2.13.

Why is `celluloid` being installed? How can I look up reverse dependencies for a gem that isn't (can't be) installed?

**My Gemfile**

```
source "https://rubygems.org"

gem "rails", "3.2.13"
gem "mysql2", "~> 0.3.13"
gem "json", "~> 1.8.0"

group :assets do
  gem "guard-rails-assets", "~> 0.1.3"
  gem "sass-rails", "~> 3.2.6"
  gem "coffee-rails", "~> 3.2.2"
  gem "uglifier", "~> 1.0.3"
end

gem "jquery-rails", "~> 3.0.4"
gem "simple_form", "~> 2.1.0"
gem "bootstrap-sass", :path => "gems/bootstrap-sass-c0e12a90ba3e"
gem "client_side_validations", "~> 3.2.6"
gem "client_side_validations-simple_form", "~> 2.1.0"
gem "therubyracer", :platform => :ruby
gem "require_relative", "~> 1.0.3"
gem "icalendar", "~> 1.4.3"
gem "whenever", "~> 0.8.4", :require => false
gem "jquery-cookie-rails", "~> 1.3.1"
gem "hominid", "~> 3.0.5"

```

**Output from `bundle install`**

```
Fetching gem metadata from https://rubygems.org/..........
Fetching additional metadata from https://rubygems.org/..
Resolving dependencies...
Using rake (10.1.1)
Using i18n (0.6.1)
Using multi_json (1.8.4)
Using activesupport (3.2.13)
Using builder (3.0.4)
Using activemodel (3.2.13)
Using erubis (2.7.0)
Using journey (1.0.4)
Using rack (1.4.5)
Using rack-cache (1.2)
Using rack-test (0.6.2)
Using hike (1.2.3)
Using tilt (1.4.1)
Using sprockets (2.2.2)
Using actionpack (3.2.13)
Using mime-types (1.25.1)
Using polyglot (0.3.3)
Using treetop (1.4.15)
Using mail (2.5.4)
Using actionmailer (3.2.13)
Using arel (3.0.3)
Using tzinfo (0.3.38)
Using activerecord (3.2.13)
Using activeresource (3.2.13)
Using sass (3.2.13)
Using bootstrap-sass (3.0.0.0) from source at gems/bootstrap-sass-c0e12a90ba3e
Using bundler (1.5.2)
Using timers (1.1.0)

Gem::InstallError: celluloid requires Ruby version >= 1.9.2.
An error occurred while installing celluloid (0.15.2), and Bundler cannot continue.
Make sure that `gem install celluloid -v '0.15.2'` succeeds before bundling.

```