WIP: Move bin/phpdoc.php to bin/phpdoc

### Rationale ###

The convention for vendor binaries in composer is to omit the ````php```` file extension.
This pull request has been opened so that it may be considered in time for the imminent release of ```2.0.0``` stable

### Changes ###
This change implements that. The old ````bin/phpdoc.php```` file is retained for backwards compatibility but now triggers an ````E_USER_DEPRECATED```` warning.

### Notes ###
The configurations for PEAR and PHAR builds has been altered but **HAS NOT BEEN TESTED**
These changes have been tested with a composer installation on a *nix system.

Please consider this pull request a work in progress

### Todo ###

- [ ] Test Windows support for PEAR builds
- [ ] Test *nix support for PEAR build
- [ ] Test *nix support for PHAR build