log buildpack name
log when entering rails 3 or 4 compile
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v68
add space to buildpack instrumentation messages
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v69
Better checking for existence of Rake tasks

With the current setup, a broken Rakefile will cause all tasks to be
considered undefined. This silently fails under most situations, for
example, pushing a Rails 3 app with a broken Rakefile will cause
asset precompilation to not work, with no error during the push.

Conflicts:
	lib/language_pack/ruby.rb
don't error out if there's no Gemfile
add bin to PATH for rake task check
ruby 1.8.7 does not have rake available
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v70
[#118] make rake_task_defined? work in the face of extraneous output

This should only ever occur if people either have a Rakefile that produces output or are using user-env-compile and their app produces output upon environment load.
update changelog about v71
rake task defined specs
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v72
need to check any line not just the last.

the celluloid gem when used with sucker_punch or sidekiq can print out
"Shutdown completed cleanly" and it will come after "true".
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