Add a new passwords dialog

https://bugzilla.gnome.org/show_bug.cgi?id=720239
Add a popup menu to copy username and password

https://bugzilla.gnome.org/show_bug.cgi?id=720239
Improve phrasing of the save password infobar

https://bugzilla.gnome.org/show_bug.cgi?id=615742
Don't show the name Epiphany
Update project urls
Use a symbolic icon for the default favicon