Full phpDoc support

[claytonrcarter]

The following items are known incomplete. They are recognized as tags, but the fields, types, optional fields, etc are not correct.

• [ ] @subpackage
• [ ] @example
• [ ] inline @example
• [ ] @license
• [ ] @package
• [ ] @source
• [ ] @uses
• [ ] @link (also inline)
• [ ] @see
• [ ] *@tag is currently parsed as a tag (the leading * should not be included)
• [ ] grouped types aren't supported at all (types, union types, array types are OK, but things like (int|string)[] are not)
  • Atom's language-php includes a spec for ((Test|int)[]|Test\\Type[]|string[]|resource)[], which ... yuck
  • this might not be need to be so robust, though, as most examples seem to be more like (int|false)