Make API settable in the command line as system property

git-svn-id: https://zxing.googlecode.com/svn/trunk@2706 59b500cc-1b3d-0410-9834-0bbf25fbcc57
Bump to allow full WXGA resolution

git-svn-id: https://zxing.googlecode.com/svn/trunk@2707 59b500cc-1b3d-0410-9834-0bbf25fbcc57