Add hackney_lib separately to update it separately
Specify hackney_lib min version
Merge branch 'master' of github.com:kadjar/facebook.ex into kadjar-master
Remove mix.lock per discussion in #1
Ignore mix.lock to prevent readding
Fix deps specification for hackney_lib
adding config library so users can set an appsecret if they like, precluding the need for passing in an appsecret proof. Also, type checking on fields to permit users to pass in a simple string of fields if they wish