LP1755625: Mltiple emails in patron editor

LP1755625: Mltiple emails in patron editor

Even though the HTML5 "email" input type allows multiple
addresses to be separated by commas there is nothing that
can be done to signal to Angular.js that this is ok; it
will only ever accept a single address. This patch forces
the type of the input tag to plain text so Angular will
rely on any supplied regex to verify the entry.

Signed-off-by: Jason Boyer <jboyer@library.in.gov>