Final BE Code clean up (remove comments, check tabs, etc)

[TDManning]

Anything Items Only - Candice

• items_merchants_requests_spec
• items_request_spec
• merchant_customer_spec
• merchant_invoices_requests_spec
• merchant_items_requests_spec

Lito is currently working on:

• routes

Lito has completed the following docs:

• merchant_controller
• merchant
• merchant_serializer
• merchant_spec
• merchant_requests.spec
• invoices_controller
• items_merchants_controller
• items_controller
• merchant_customers_controller
• merchant_items_controller
• customer
• invoice_items
• invoice
• item
• transaction
• customer_serializer
• error_serializer
• invoice_serializer
• item_serializer