Multitask transitive dependencies unpredictable.

Not sure if this is a bug or a misunderstanding on my part. I seem to be getting inconsistent race-condition like behavior with the following setup:

Rakefile:

multitask :default => [:one, :two] do
end

task :two => :one do
  puts "echo 'should not run?'"
end

task :one do
  raise
end

I would expect to never see "should not run?", but I see it intermittently.

for i in {1..10}; do rake 2>/dev/null | grep 'should'; done
echo 'should not run?'
echo 'should not run?'

I was able to reproduce.
Working on a fix.

Don't run tasks if it depends on already invoked but failed task. Fixes

The following PR attempts to fix this issue
#252

Merge pull request #252 from grzuy/fix_multitask_failures

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