fixed pep8 issue E265

  * E265 block comment should start with '# '

E265 was introduced in pep8 1.5 (2014-03-26).

Change-Id: I076addadd2e67a8ac4162c706a36239f4af37a8c
Remove duplicate docs for MessageHandlingServer

We're currently including these docs under the RPC server and
notification listener sections causing sphinx to have a minor panic
attack.

  WARNING: duplicate object description of oslo.messaging.MessageHandlingServer

Change-Id: I76a4d9a7f55f7b65bcdd2bdb814904dc55bd1068
Merge "Remove duplicate docs for MessageHandlingServer"
Merge "fixed pep8 issue E265"
Replaced 'e.g.' with 'for example'

According to the IBM Style Guide the Latin abbreviation 'e.g.'
should be replace by 'for example'.

Change-Id: I694df5ed62213e29bdf35f781fd6f310b7df77a6
Fix AMQPListener for polling with timeout

On timeout, poll() should return None, not raise an exception (Timeout).

Add also an unit test.

Change-Id: I1ed5ae2f093841111f0b691dddb879c16d218b73
Merge "Replaced 'e.g.' with 'for example'"
Add release notes for 1.4.0.0a2/a3

Change-Id: I9e2a229ffa5bd9b604118d12d54e2f7809b9d49a