class Rake::Application

def collect_tasks

Environmental assignments are processed at this time as well.
given, return a list containing only the default task.
Collect the list of tasks on the command line. If no tasks are 
def collect_tasks
  @top_level_tasks = []
  ARGV.each do |arg|
    if arg =~ /^(\w+)=(.*)$/
      ENV[$1] = $2
    else
      @top_level_tasks << arg unless arg =~ /^-/
    end
  end
  @top_level_tasks.push("default") if @top_level_tasks.size == 0
end