add copy of help site to app, make it easy to get to.
build for 64-bit ARM processors. drops support for iOS 5.1, minversion now 6.0.
long-awaited arrival of a loading progress bar
add pixel fix for "loading" art
make preview img when "alt tabbing" back into app render correctly
back out prev change, causes incorrect toolbar icons
fix some 64bit warnings

(leaving warnings in third-party code for now)
1.4