Consider populating the Subject field when sharing a URL via email
This can be done by adding `android.intent.extra.SUBJECT` to the intent.
I would have to do a bit of testing to see if I can add this to the share intent without it having a negative impact on non-email apps that pickup the intent. If so, I think adding it makes a lot of sense. If not, I am not sure I want to have another entry in the share menu just for email.