fixed pep8 issue E265

  * E265 block comment should start with '# '

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

Change-Id: I076addadd2e67a8ac4162c706a36239f4af37a8c
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