Add option for tweet formats

[peterwilsoncc]

There are two common formats used by people live tweeting a talk, this example tweet could be formatted in one of two ways:

#wcbne @\maddisondesigns: Great feature of WooCommerce for membership is integrated membership and shop logins

Or

Great feature of WooCommerce for membership is integrated membership and shop logins -@\maddisondesigns #wcbne

I think there is some merit it providing a formatting option for users. Would you be interested in a PR?

[kevinmarks]

if this is a style you prefer, sure; I like leading with the hashtag and speaker myself, as I think it is clearer.