Rails 3.1 bundle conflicts

```
$ bundle install
Fetching source index for http://rubygems.org/
Bundler could not find compatible versions for gem "arel":
  In Gemfile:
    exception_logger (>= 0.1.11) ruby depends on
      arel (~> 1.0.0.rc1) ruby

    rails (= 3.1.2) ruby depends on
      arel (2.2.1)
```

Note also that meta_where explicitly says not to use it w/ 3.1, and recommends Squeel instead.
