Updated services index.js to expose card service
Unlinked services from auth/membership modules and installed via npm now that it supports local paths.
Updated API to use authentication module and user/card services
Updated authentication package.json to include version
Updated authentication module with index.js and export of module
Updated membership package.json to include version
Updated membership module with index.js and export of module
Updated addCard method to also require ID, added/updated unit tests.
Added models module
Updated userService to use new user model, updated associated unit tests
Fixed broken unit test in card service