Stop config task generating templates

We want templates to be committed to the source repo so that local
customization is easier and to allow for better discovery of
configuration file templates, i.e. no magical generation at
configuration time.

Removes references to local overrides in the README but leaves the code
in place for backwards compatibility.
Make *.dice the default extension for templates
Bump version to 0.5.0
Merge branch 'develop' into feature/make_committed_templates_the_norm

Conflicts:
	lib/dice_bag/config_file.rb
	lib/dice_bag/version.rb
Merge pull request #44 from mdsol/feature/make_committed_templates_the_norm

Make committed templates the norm