bucet_create: example cleanup
indexes: removed index update at upload/delete operations
debug: alot of new debug prints at info level like partial write and so on

Index update was dropped because it is currently slow and doesn't scale.
When elliptics starts supporting much more scalable indexes, it can be turned on again.
I did not remove the code, but added comments around index mixin and on_delete handler.
Merge branch 'elliptics-2.25' of github.com:reverbrain/rift into elliptics-2.25

Conflicts:
	include/rift/bucket.hpp
	include/rift/io.hpp
v2.25.0.10.0