Update ci_tools.rake
Update ci_tools.rake

A solution for #749.

In *Gemfile* is defined:
```ruby
group :development, :test do
  gem 'rspec'
  ...
```
and then in the code:
```ruby
unless Rails.env.production?
   RSpec::Core::RakeTask.new do |task|
    ...
```
So if RAILS_ENV is not specified, RSpec is not defined.
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