PhoneNumberType::VOICEMAIL was undefined

Also corrected PHPDoc tag for a function in NumberFormat (boolean was incorrectly spelt)
Reorganise files to make it more PSR-0 compliant
Remove demo.php and update updateMetadata.sh
Add a copy of the Apache 2.0 LICENSE
Merge pull request #2 from giggsey/moveFolders

Rearrange Code to a better directory structure