Admin invoice generation

[ingleo]

Functionality

• Implementation to generate admin invoice consecutive and retaining agent for invoice :+1:
• Implementation of meteor method of generate invoice to be accesible from payment and update payment status :+1:
• Changed conditionals to payu-payment for transaction :+1:

Fixed

• Deleted json( ) method of response object from rest services :+1:
• Removed register from iurest invoice when is freeDays :+1:
• Moved service payment-service to shared/services folder :+1:
• Changed labels of en dictionary to spanish translate :+1:
• Removed base-64 module from package :+1:

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