Update requests version

A python-requests upgrade process was started before grizzly and was
planned to get into havana. Current projects don't depend on
requests<=1.1 anymore and this upgrade is needed in python-glanceclient.

Clients using python-requests are listed bellow:

Cinder:
https://github.com/openstack/python-cinderclient/blob/master/tools/pip-requires#L3
Nova:
https://github.com/openstack/python-novaclient/blob/master/tools/pip-requires#L4
Keystone:
https://github.com/openstack/python-keystoneclient/blob/master/tools/pip-requires#L4

Change-Id: I56c42eb7fdc5ac19736f125d3bffc52c9e26efee
Update wsme to version 0.5b2 for upstream bug fixes

This is needed by ceilometer to return non-default status.

Change-Id: I2ae5796a7c8bcd7de021562d03351ab30eba3737
Add python-six dependency

Added python-six dependency for
python2/python3 conversion.

Change-Id: Iab79f39b82810112b87c50a89336f23146f9c572
Signed-off-by: Chuck Short <chuck.short@canonical.com>
Merge "Add python-six dependency"
Merge "Update wsme to version 0.5b2 for upstream bug fixes"
Merge "Update requests version"