Update all the services to log all the messages which are generated before and
during config parsing to sys.stdout (previously, they were ignored since we
didn't set up a loger until after config parsing).
Update all the services to report the version via "--version" flag.
Add missing import.
Fix broken index page and return StackStorm version on the index page by
default.

Previously the index page was broken and "template not found" error was
returned.
Merge branch 'master' into services_version_reporting
Display a static page with a version and documentation URL instead when hitting
/.
Use st2common.__version__ attribute in the docs to determine the latest version.
Update github_repo attribute.
Merge pull request #836 from StackStorm/services_version_reporting

Report service version via "--version" flag