avoid error when using module for the first time without having used battleschool before
When battle hasn't been executed the file battleschool_extra_vars.json does not exist. Therefore it is necessary to check the existence of this file first.
transfer ownership to spencergibb github repo
bumped minor version
Merge branch 'master' into devel
closes #11 and #12 be defensive about empty sections of config.yml
added merge devel branch