Fixes #37

Better handling of mass data files with numeral first file names 1_data.yaml

Thanks @operte

Works now on titles

Thanks @miffels

Jinja2 env over template

due to incompatibilities with other plugins I have reverted the changes introduced in 0.1.5

Thanks @miffels nice upgrades

• Better handling of default _data in both default locations
• Ability to have multiple data paths
• Better readme