Fix eval_but_ignore and add unit test

Change-Id: Ibb180528bf7496027b263ad59db5675129e2c0d8
Extended Notifier to allow some HTML formatting in alert messages

Extended Notifier to allow some HTML formatting in alert messages
Added AboutScreen property that lets developers provide information
about their apps. Updated refereence documentation.

Change-Id: Ic81e0554f586048f3cf83b53904b2d85aa65ec8f