idendro 1.5.3

• our JSS paper referenced
• vignette added
• minor improvements

v1.5.2

idendro 1.5.2

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• 'plumbr' and 'grDevices' packages must be depended upon (in order to
  let users use their functions directly)

v1.5.1

idendro 1.5.1

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• version updated to align with that of 'idendr0'
• a bug with "locked environment" in createButtons()" experienced under
  R 3.2.0+ fixed
• informative warning()'s turned into message()'s
• several minor bugs fixed