v0.15.0

Added

• BackReferenceReadNode#name is now provided.
• Index{Operator,And,Or}WriteNode are introduced, split out from Call{Operator,And,Or}WriteNode when the method is [].

Changed

• Ensure PM_NODE_FLAG_COMMON_MASK into a constant expression to fix compile errors.
• super(&arg) is now fixed.
• Ensure the last encoding flag on regular expressions wins.
• Fix the common whitespace calculation when embedded expressions begin on a line.
• Capture groups in regular expressions now scan the unescaped version to get the correct local variables.
• * and & are added to the local table when ... is found in the parameters of a method definition.