add update_profile intent,tab (issue #7)

AccountIcon is changeable, but banner image is not changeable.
I still work on it.
fix UserInfoFrameTab doesnt show icon
UserInfoFTab: support openimg background (fixes #52)

I want to show as background, but I failed...
UpdateProfileTab: support updating bkgrnd, banner (fixes #7)

with context menu. In Linux, we use zenity with blocking
  Swing Event Queue...
update Changelog, README
Merge branch 'turenar/iss7-update-profile'