fixed selectors for chargeback test

removed commented lines
initial updates to automate
support editing existing instance, custom flash message, and reliable field text entry

completed support for add new instance

import explorerclass for assert

support unique flash message

support edit instance, custom flash message, and reliable field text entry
Add a fill_field_*_with_wait
replace custom fill field with new method from pages.py, also add _with_wait on some field better browser support