我的gemspec显然需要active_support ~> 3.0，但是捆绑商未能bundle install说我的宝石需要active_support = 3.0。 WTF捆绑器？谁能解释一下呢？
$ gem install code_filter
Successfully installed activesupport-3.0.0
Successfully installed active_support-3.0.0
Successfully installed code_filter-0.1.1
$ gem dependency code_filter
Gem code_filter-0.1.1
active_support (~> 3.0, runtime)
$ bundle
Fetching gem metadata from http://rubygems.org/.......
Fetching gem metadata from http://192.168.10.22/...
Fetching gem metadata from http://rubygems.org/...........
Fetching gem metadata from http://192.168.10.22/..
Bundler could not find compatible versions for gem "activesupport":
In Gemfile:
code_filter (= 0.1.1) ruby depends on
activesupport (= 3.0.0) ruby
json_builder (~> 3.1) ruby depends on
activesupport (3.0.20)