Don't register aliases on PHP 7

#184 Add a flag to NodeTraverser to avoid cloning nodes

Rename Cast\Object as well

As it will very likely be soft-reserved in PHP 7.

Old alias is still available, as usual.

Fix a few more Scalar\String_ occurances

Totally forgot that the parser uses macros...

Replace another Scalar\String occurance

Also canonicalize NameResover tests to avoid those pesky CRLF
issues.

Rename nodes for compat with PHP 7

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

Add support for T_HASHBANG (HHVM)

Ensure compatibility with multiple autoloaders

Running a .phar or regular PHP executable that requires and includes its own
version of php-parser will cause a "cannot redeclare class" er

Ensure compatibility with multiple autoloaders

Running a .phar or regular PHP executable that requires and includes its own
version of php-parser will cause a "cannot redeclare class" error if said
executable also includes the autoloader of the current working directory.

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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.

Drop whitespace after ... varargs collection

Also drop an obsolete pretty printer test.

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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Add a few more string interpolation tests

Originally wanted to simplify the pretty-printer output, but ...
edge cases everywhere :/

Add documentation TOC to readme

Add "use" builder

Add support for global namespace in NS builder

NULL argument can now be used to create a global namespace {} block.

Use real properties for storing subnodes

Instead of storing subnodes in a subNodes dictionary, they are
now stored as simple properties. This requires declarating the
properties, ass

Use real properties for storing subnodes

Instead of storing subnodes in a subNodes dictionary, they are
now stored as simple properties. This requires declarating the
properties, assigning them in the constructor, overriding
the getSubNodeNames() method and passing NULL to the first argument
of the NodeAbstract constructor.

[Deprecated: It's still possible to use the old mode of operation
for custom nodes by passing an array of subnodes to the constructor.]

The only behavior difference this should cause is that getSubNodeNames()
will always return the original subnode names and skip any additional
properties that were dynamically added. E.g. this means that the
"namespacedName" node added by the NameResolver visitor is not treated
as a subnode, but as a dynamic property instead.

This change improves performance and memory usage.

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Implicit public should not generate as explicit public

Revert "Create .gitattributes with basic export-ignores"

This reverts commit 0dd2b9a74c46149847d79e72cf418a0f519e3ed9.

Not having tests available causes issues for downstream
di

Revert "Create .gitattributes with basic export-ignores"

This reverts commit 0dd2b9a74c46149847d79e72cf418a0f519e3ed9.

Not having tests available causes issues for downstream
distributors. See issue #178.

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Fix lexer tests for HHVM

HHVM does not throw warnings from token_get_all()
for invalid chars and unterminated comments. This
is not really integral functionality, so I'm okay
to

Fix lexer tests for HHVM

HHVM does not throw warnings from token_get_all()
for invalid chars and unterminated comments. This
is not really integral functionality, so I'm okay
to just skip it to get a passing HHVM build.

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And make it work on PHP 5 as well...

Make tests compatible with PHP 7

When parsing on PHP 7 we will no longer be able to deal with
code that contains invalid octal literals. Currently we'll fatal,
after engine exception

Make tests compatible with PHP 7

When parsing on PHP 7 we will no longer be able to deal with
code that contains invalid octal literals. Currently we'll fatal,
after engine exceptions land we'll throw an exception instead.

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Add PHP 7 to travis build

Added php shebang

prevent a unnecessary concat

analog to https://github.com/nikic/PHP-Parser/commit/b7ffdbbb929f9f07780a236659d1d1baf68ef137