Add configuration to be similar to Github's Jekyll
Add configuration to be similar to Github's Jekyll

Add
safe: true
lsi: false
to _config.yml.

Since Github will use these values, it is better to add them here so
that we don't get confused in the future. Particularly, the 'safe: true'
option means that we can't use third party plugins.

darcamo/darcamo.github.com,darcamo/darcamo.github.com