CHANGELOG for version 0.11

Bug Fixes:

Changes:

- Logs do not contain kamaki.clients pids by default [#4242]
- Replace page_hold method with pydoc.pager [#4279]

Features:

- New config option log_pid (default: off) can allow pid-logging [#4242]
- Expand kamaki.cli unitests for the following packages ( [#4058] ):
  errors
- Modify print methods in cli utils to use arbitary stream objects [#4288]