xlsx_buffer_json

This code is a copy of xlsx-to-json-lc. I made few changes in the source code to suit my use case

I have used xlsx_buffer_json which takes input as buffer and output as list of js objects. xlsx_buffer_json module uses xlsx_buffer module which was also a copy of xlsx module but i removed hard coded value which was restricting me to send only file object. example: how to upload excel file and keep it in memory and parse the object to js objects which can used to DB refer: https://github.com/motomohg/workspace.git