Environment setup issues

Created by: latortuga

I'm on Ubuntu 14.04 LTS and running bin/setup gives me issues with the default configuration:

Couldn't create database for {"adapter"=>"postgresql", "database"=>"administrate-prototype_development", "encoding"=>"utf8", "host"=>"localhost", "min_messages"=>"warning", "pool"=>2, "timeout"=>5000}
fe_sendauth: no password supplied
/home/drew/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.2/lib/active_record/connection_adapters/postgresql_adapter.rb:651:in `initialize'
/home/drew/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.2/lib/active_record/connection_adapters/postgresql_adapter.rb:651:in `new'
/home/drew/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.2/lib/active_record/connection_adapters/postgresql_adapter.rb:651:in `connect'
/home/drew/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.2/lib/active_record/connection_adapters/postgresql_adapter.rb:242:in `initialize'
/home/drew/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.2/lib/active_record/connection_adapters/postgresql_adapter.rb:44:in `new'

...with a bunch more output. I commented out the host portion in database.yml and all works perfectly. Would you be amenable to accepting a PR where I modify the setup script to copy a database.yml.example to database.yml and add database.yml to .gitignore?