* Follows proper autoloading standards
- Splits PHP classes in descriptor.php into separate files
- Splits MapFieldIter and RepeatedFieldIter into separate files
- Moves descriptor.php to Internal/functions.php
- Moves all namespaced functions into Iternal/functions.php
* fixes Makefile.am for added php files
* [PHP] moves all functions to GPBUtil
* removes description.php from the makefile
This pull request includes two implementation: C extension and PHP
package. Both implementations support encode/decode of singular,
repeated and map fields.
