0.15.0

• Make line control more explicit.

  • Remove Printable::$hasAttribute, $hasComment, $isFirst, hasAttribute(),
    hasComment(), and isFirst().

  • Remove Styler::$atFirstInBody, $hadComment, $hadAttribute,
    forceSingleNewline(), maybeDoubleNewline(), and rtrim().

  • The Line object now tracks if a margin above or below is advised for
    addition, and if a margin above or below is allowed.

  • The Styler methods now specify margin additions and allowances on the
    current Line object.

• Protect various Styler methods that were mistakenly public.

• Add method Styler::blankLine() to create new Line instances.

• Rename Line::newline() to Line::blankLine().

• Styler::newline() now applies one line of margin above and below auto-split
  lines, subject to margin allowances; updated tests to reflect this
  expectation.

• Fix a logic-breaking bug where final else gets lost after else if
  (refs #4).