Update documentation

Update stub file

Use ast\Metadata object for ast\get_metadata()

Add appveyor.yml (#73)

Make flags information slightly more accurate

Use ast\get_metadata() in AST dumper

Add ast\get_metadata() function

This function returns metadata about the AST kinds. Currently this
mainly provides the flags supported by each AST kind.

Param flags are combinable

Update Windows DLL URL

Add examples for some tricky nodes/flags

Closes #33 and #35.

Add missing changelog entry regarding PROP_ELEM

Resolves issue #70.

Back to dev

Release version 0.1.5

Mark version 35 as deprecated

Mention in docs that ast\Node\Decl is no longer used

Mark versions 45 and 50 as supported.

Update changelog

Regenerate stubs

Add CLOSURE_USE_REF flag

With the CLOSURE_ prefix to distinguish it from the namespace
USE_ flags.

Rename RETURNS_REF to FUNC_RETURNS_REF

In version 50+, return an empty statement list in \ast\parse_file

This makes \ast\parse_file and \ast\parse_code consistent.

file_get_contents has a similar check of the result of s

In version 50+, return an empty statement list in \ast\parse_file

This makes \ast\parse_file and \ast\parse_code consistent.

file_get_contents has a similar check of the result of stream_read,
it will return the empty string if it returned null.

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Expose FUNC_GENERATOR flag

Add skipif

Don't use Decl nodes in version 50

Recognize "object" types in version 45

Also shift off the __declId change to version 50.

Move version into ast_state_info