Give correct messages when importing/updating a hook
Fix an undefined offset notice when using the generate command

When running `wp funcref generate <directory>`, an undefined offset
notice is being generated, because the optional `<output-file>`
argument is being treated as if it is required.
Brutally removed submodules.
Reintroduced composer.json
Merge pull request #49 from JDGrimes/generate-undefined-offset

Fix an undefined offset notice when using the generate command
Made filters consistent with function names. Fixes #33
Clean up the hook message indenting conditionals
Merge pull request #47 from JDGrimes/hook-import-message

Give correct messages when importing/updating a hook
Added license to composer.json
Removed custom autoloader in favor of composer one.
Documented user argument in readme and code.
Added Composer to requirements in readme and quick note on setup.

Finally fixes #31
Added parent call in leaveNode to fix missing functions/classes in results. See #55
Commented out isFinal calls for properties since no longer defined upstream (?)
Renamed namespace to WP_Parser.
Changed autoload type to classmap.
Moved importer class to lib.
Moved command class to lib.
Renamed, namespaced, and moved file reflector.
Renamed, namespaced, and moved hook reflector.