username and email request for lti module

allow username and email can be passed to a lti third party app
ask user permission when lti button is clicked
allow course editor to customize text on lti launch button
s/'Open in a new page'/'Open in New Page'/ as that is what appears to users (see https://github.com/paulmedwal/edx-platform/blob/newlti/common/lib/xmodule/xmodule/lti_module.py#L146)