Makefile fixes for python3.4

Signed-off-by: Tim Van Steenburgh <tvansteenburgh@gmail.com>
Don't add quotes to 'juju set' args

They aren't needed, and end up becoming part of the actual
arg string values since there's no shell to remove them.

Signed-off-by: Tim Van Steenburgh <tvansteenburgh@gmail.com>
Adding series to sentry when it exists on charm.
Merge pull request #26 from tvansteenburgh/python34-makefile-fixes

Makefile fixes for python3.4
Merge pull request #27 from tvansteenburgh/juju-set-quotes

Don't add quotes to 'juju set' args
Merge pull request #28 from mbruzek/master

Adding series to sentry when it exists on charm.