Bug 847168 - [User Story] Email Signature

Until a save happens, body.text is not updated, so this will always be false.

Looks like the test should be `var hasNewContent = this.fromEditor() !== this.origText;` since we are dealing with contentEditable and need to convert brs to \n for the comparison to work. This is also what is used to give to the composer, so makes a good fit for the comparison.