* Add descriptors test
* Update descriptors tests
* Add public descriptors
* Add test_desriptors.proto to test script
* Update composer files
* Remove references to GPBType, update tests to be compatible with c
* Update for c extension compatibility
* Remove nested enums for descriptor, update tests
* Strip leading '.' from descriptor name
* Update tests with test for getClass, fix OneofDescriptor
* Add new files to Makefile.am
* 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
