- Upstream update to 2.5.0
* New construct "import public"
* New enum option "allow_alias"
* C++: New generated method set_allocated_foo(Type* foo)
* C++: Added SetAllocatedExtension() and ReleaseExtension()
to extensions API
* Java: Added getters/setters to access the underlying ByteString
of a string field
* Java: New operations for substring(), prepend(), and append()
* Java: New method findInitializationErrors()
* Python: Support for dynamic message creation
* Python: Fixed custom options were not correctly populated
* Python: Added EnumTypeWrapper
* Python: Added ParseMessage(descriptor, bytes)
* Various bug fixes and optimazations
- Drop gtest-1.5, which is now included by the archive from
the upstream