rake -T and :git on gem in Gemfile ...

gistfile1.txt

source 'https://rubygems.org'
# details omitted ...
#1
gem 'rdoc_rest', :git => 'git://github.com/kedarmhaswade/rdoc_rest.git'
#2
#gem 'rdoc_rest'
# To use ActiveModel has_secure_password
# gem 'bcrypt-ruby', '~> 3.0.0'

# To use Jbuilder templates for JSON
# gem 'jbuilder'

# Use unicorn as the app server
# gem 'unicorn'

# Deploy with Capistrano
# gem 'capistrano'

# To use debugger
group :development do
  gem 'ruby-debug19', :require => 'ruby-debug'
end