Release 0.5.3

Configure expiry for cached data (#9)

Previously the download data was cached forever, this changes the
default to 24 hours and adds a new --cache-period option to specify the
time in minutes.

Fixes #8

Fix setup.py for Pypi

Load README into the long description field for pypi.

Signed-off-by: Billy Olsen <billy.olsen@gmail.com>

Fix rmadison in snap

rmadison queries failed to work in snap due to invoking external
command. This is fixed by not invoking the rmadison external cmd
and simply query the remote madison service directly (which is
all that rmadison does anyways).

Signed-off-by: Billy Olsen <billy.olsen@gmail.com>

Dynamically determine version in setup.py

Add support to dynamically determine the version in setup.py
based on the current git tags. This is inline with how the
snap is built.

Signed-off-by: Billy Olsen <billy.olsen@gmail.com>

Use local variable for appending -proposed

Previously the loop across packages would use the dist package found
to determine if it was found in a -proposed pocket. If it was found,
it would simply append -proposed to the openstack release name. This
should be done in a local variable so that -proposed doesn't get
appended to subsequent packages.

Fixes #4

Signed-off-by: Billy Olsen <billy.olsen@gmail.com>