- Update to version 0.21:
* zbarcam-qt: allow selecting codes via GUI interface
* When both enabled, ISBN-13 has precedence over ISBN-10
* ZBar is now using Travis CI for continuous integration tests
* Convert INSTALL and README to markdown and update them
* Improve ZBar testing code and make easier to run the tests
* Fix build with Clang
* Add simple dbus IPC API to zbarcam.
* zbarimg: display only the compiled symbologies
* v4l2: make ZBar build and run on Kernels < 3.16
* configure.ac: The pdf417 code is incomplete. Warn about that
* Add Debian packaging and Travis CI configuration
* Add barcode examples for different supported symbologies
* Several improvements at the building system
* Add support for SQ code symbology
* v4l2: add fallback for systems without v4l2_ext_controls which field
* v4l2: use device_caps instead of capabilities
* v4l2: make v4l2_request_buffers() more generic
* release video buffers after probing and request them again when needed
* Ignore ENOTTY errors when calling VIDIOC_S_CROP
* doc/Makefile.am.inc: clean html generated files
* Add --disable-doc configure option to disable building docs
* Fix function protoype to be compatible with recent libjpeg
* Wrap logical not operations into parentheses
* INSTALL: warn that autoconf should be called before configure
* code128: fix error logic
* convert: ensure that it will not use a freed value
* zbar: use g_thread_new() instead of g_tread_create()
* zbargtk: add a missing break
* gtk/zbargtk: add a missing check if zbar->window is not null