Support PHP 7.1 class constant visibility

a) CLASS_CONST_DECL now uses modifier flags. For PHP < 7.1 we
emuate MODIFIER_PUBLIC here for consistency.
b) CONST_ELEM can now have a d

Support PHP 7.1 class constant visibility

a) CLASS_CONST_DECL now uses modifier flags. For PHP < 7.1 we
emuate MODIFIER_PUBLIC here for consistency.
b) CONST_ELEM can now have a docComment properts (in analog to the
property on PROP_ELEM).

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Tweak stubs file

Add script to generate stubs

Move both gen scripts into common scripts/ folder.

Merge pull request #22 from zeroedin-bill/add-ast-stub

Add ast_stub.php

Add second parameter $version to parse_code()

The method `parse_code()` requires the second parameter `$version`,
but it is missing in some examples. The commit fixes this.

Add install instructions with Windows DLLs

Back to 0.1.2-dev

Release version 0.1.1 with OSX build fix

Avoid premature macro resolution / Fix OSX build

AST_STR(true) and AST_STR(false) were resolved to AST_STR(1) and
AST_STR(0), so go back to using a str_ prefix everywhere.

Back to 0.1.1-dev

Version 0.1.0

Mark version 20 as current

Rename some child names

add ast_stub.php

to provide phpdoc stub for use with IDEs

Add USE_* and MAGIC_* flag constants

This drops the effective dependency on tokenizer.

Also replace token numbers with %d as these are unstable.

Set version to 0.1.0-dev

Make $version argument required

[bc-break]

Move docComment to PROP_ELEM

Change some node names

Commit test files

Forgot to git add...

Update version changelog

Flatten nested STMT_LISTs

Some nodes like ECHO always get wrapped in STMT_LIST, resulting in
some weird syntax trees.

Use AST_VAR node for static var + catch var

For version 20. Previously this was a simple string with the
variable name.

Fix child names for virtual nodes

Use version 30 for named children