angularization of the import handlebars
fixes #1578 using angular-file-upload directive to handle drag and drop

and file chooser dialog of muliple or single files
https://github.com/danialfarid/angular-file-upload
for #1579 jshint and preparing to use Import commonjs in the angular directive
fixes #1579 updated client side file reading to use slice

and connected to import directive shows the csv table, next step is to add the drag and drop column headings and make the contenteditable work