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command = {   
    'group' : {                                       //mongodb group command   
       'ns' : 'pings',                                //the collection to query   
       'cond' : {'active.end' : { $gt: new Date() }}, //active.end must be in the future   
       'initial': {'count': 0},                       //initialize any count object properties   
       '$reduce' : 'function(doc, out){ out.count++ }',   
       'key' : {'url': 1}                             //fields to group by   
    }   
}
  

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# 0. Make sure you have Ruby 1.9.3 installed, and optionally RVM and PostgreSQL

# 0.2 If you are on the Mac, make sure you have a c compiler by installing XCode Command Line Tools or gcc4.2 with homebrew
# https://github.com/mxcl/homebrew/wiki/Custom-GCC-and-cross-compilers

# 0.5 Make sure you have bundler version ~> 1.2 as Rails depends on it
gem install bundler

# 1. Get edge Rails source (master branch)
git clone https://github.com/rails/rails.git