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Fixes ytti/oxidized#242.
Fixes ytti/oxidized-web#38.
Added a check to verify the key exists for a group before returning.
Might fic a group issue in ytti/oxidized#171.
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We need to return value of 'r' instead of value of previous evaluation.
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a) grit is not supported, rugged is
b) grit requires git CLI installed, rugged does not
c) grit needs monkey patching to work, rugged does not
Closes #21
Closes #22
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in addition:
  - move vars helper to separate file
	- add csv support for node variables
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