[cs] use PHP 5.4 short array, since PHP 7.0 is min version

Generate PHP 7 type annotations

Drop support for false return value in NodeTraverser

Throw if NodeVisitor returns invalid value

Throw on nested array in NodeTraverser

The AST never uses deeply nested arrays, so don't support this in
the node traverser. Throw an exception instead.

Implement NodeTraverser::STOP_TRAVERSAL

Conflicts:
lib/PhpParser/NodeVisitor.php

Update doc comments after previous comment

Make some of the type annotations more accurate, and complete the
generated doc-comments to be complete (with description and
parameter ann

Update doc comments after previous comment

Make some of the type annotations more accurate, and complete the
generated doc-comments to be complete (with description and
parameter annotations.)

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Add non-void return types

Move constants into NodeTraverser class

Not that the interface makes much sense anyway, but these are
implementation details of a specific traverser.

Introduce ErrorHandler

Add ErrorHandler interface, as well as ErrorHandler\Throwing
and ErrorHandler\Collecting. The error handler is passed to
Parser::parse(). This supersedes the t

Introduce ErrorHandler

Add ErrorHandler interface, as well as ErrorHandler\Throwing
and ErrorHandler\Collecting. The error handler is passed to
Parser::parse(). This supersedes the throwOnError option.

NameResolver now accepts an ErrorHandler in the ctor.

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Remove support for node cloning in traverser

Add sanity check for leaveNode() return value

Disable cloning in traverser by default

#184 Add a flag to NodeTraverser to avoid cloning nodes

Add NodeTraverser::DONT_TRAVERSE_CHILDREN support

Port library to use namespaces, with BC for old names