Make Atom to print tz offset for aware datetime

Previously it simply treat every datetime as UTC
even if it has tzinfo.
Merge pull request #254 from crosspop/master

Make Atom to print time zone offset for aware datetime
Remove run-tests.py
MANIFEST cleanup

- templates is gone
- testing with ``python setup.py sdist``, it seems that the files are
  already included when including the top-level tests folder.
Use keyword arguments for redis cache.

StrictRedis has a different argument order for some reason.

Fix #406
Merge pull request #583 from untitaker/strict_redis

Use keyword arguments for redis cache.
Reword cache documentation

Fix #449
test server fixture now uses subprocesses
Add tests for reloader watching
Change return value of dev_server fixture
Remove global port variable