Revert "spec for 676391bd3b175287b681b91e5b18226efc013d36"

This reverts commit 6c7bc214fec2b177618563df417e74b32199c0f8.
Revert "need to check any line not just the last."

This reverts commit 676391bd3b175287b681b91e5b18226efc013d36.
Revert "rake task defined specs"

This reverts commit 00d1d3b4ac3b669bd606a1c968fb00ab82f6a648.
Revert "[#118] make rake_task_defined? work in the face of extraneous output"

This reverts commit 3fe915518c276ba2c7d5d2a083f3642928acaa6b.
Revert "ruby 1.8.7 does not have rake available"

This reverts commit 9bb7cbfdd5f0761716de50de843f5f4d738c82a3.
Revert "add bin to PATH for rake task check"

This reverts commit 3243f4242190fd356d67e6f060a6326449c63f5d.
Revert "don't error out if there's no Gemfile"

This reverts commit f6270083f7f19611ff8018d322f81449f77aad27.
Revert "Better checking for existence of Rake tasks"

This reverts commit 9b96e6d1a6b15f8b90417679fb7f78943c2da0f1.
special case JRuby 1.7.3 to older JDKs due to jffi bug

See https://github.com/jruby/jruby/issues/626