Made username and password accessors more idiomatic

Signed-off-by: James Chan <ashchan@gmail.com>
use Iiro's icon set
credit Iiro in about
don't notify when connection or username/password error occurs
also set the DMG icon
now I'm called James Chen
version 0.4.3 for release
new dsa_pub.pem
correct character in the name of Iiro
compressed icons to reduce app size
got back the old dsa_pub.pem
Making entries in the message list clickable (they take you to the message in Gmail)
icons for preferences toolbar
added toolbar to preferences window
toolbar implementation
moved the window position
added Simplified Chinese nib for Preferences window
added localizable strings for English and Simplified Chinese
use localizable strings
project file updated