Create ASCO meeting abstracts.js

This scraper is designed to pull bibliographic information from abstracts of the annual meeting of the American Society of Clinical Oncology (via meetinglibrary.asco.org) 

This file includes the existing Zotero Translator framework by  Erik Hetzner, as well as my own contributions.  

Known issues: Abstracts from certain years may not pull bibliographic info correctly, due to the non-generalized X paths I used. This translator is still a work in progress.