Merge pull request #30 from d4ndo/master

Removed the "r" in *optstring
Missing breaks in switch. (Thanks to ßlúèÇhîp)
Merge branch 'master' of github.com:fukuchi/libqrencode
Bumpbed verstion tio 3.4.3.
Merge branch 'master' into 3.4
Release note has been updated.
Typo fix.
Added an acknowledgement record.
Copyright year updatd.
Documents updated.
Reed-Solomon code routine has been completely rewritten.
Code cleanup.
Code cleanups and refactoring.
Bumped version to 3.9.0.
Help messages improved.
Minor bug fix.
Some short/overrunning underlines fixed.
Avoid to use sdl-config. (Thanks to Heiko Becker)
Bugfix: Numerical result out of range.
To meet the specification at version 40 maximum charakter.