Rename nodes for compat with PHP 7

The old names will still be available on PHP 5.x.

Add support for spaceship operator (<=>) [PHP 7]

Added as Expr\BinaryOp\Spaceship.

Add support for null coalesce operator (??) [PHP 7]

Added as Expr\BinaryOp\Coalesce.

Add support for return type declarations [PHP 7]

This adds an additional "returnType" subnode to Stmt\Function_,
Stmt\ClassMethod and Expr\Closure, as well as the corresponding
suppo

Add support for return type declarations [PHP 7]

This adds an additional "returnType" subnode to Stmt\Function_,
Stmt\ClassMethod and Expr\Closure, as well as the corresponding
support in the name resolver and pretty printer.

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Implicit public should not generate as explicit public

Disallow new without a class name

Fixes #137.

Add constant dereferencing, a list-minute 5.6 change

Preserve case of "static" class name

Move Stmt\Namespace_::postprocess() to parser

Make names in the parser more descriptive

And improve the code a tad bit in general.

I left YY2TBLSTATES and YYNLSTATES around, because I don't fully
understand their role in th

Make names in the parser more descriptive

And improve the code a tad bit in general.

I left YY2TBLSTATES and YYNLSTATES around, because I don't fully
understand their role in the action double indexing.

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Use normal properties instead of static ones

Separate parser code from generated data

Update constant scalar expression support

Add support for function and constant import (PHP 5.6)

Add support for constant scalar expressions (PHP 5.6)

Add support for pow operator (PHP 5.6)

Add support for argument unpacking (PHP 5.6)

Add support for variadic parameters (PHP 5.6)

Remove inline Name[] creations

This ensures that the attributes on the Name nodes are correct.

Port library to use namespaces, with BC for old names