* img2sixel.c: Use gdk-pixbuf and libcurl.
* build-gdkpixbuf.sh: Added.
this commit is imported from arakiken/libsixel.
https://bitbucket.org/arakiken/libsixel/commits/fda0bcab1ec2598bada3d102d8f0cf35d848f6ff
Merge branch 'travis' into configure-gdkpixbuf
Merge branch 'travis-gd-integration' into kmiya
Merge branch 'travis' into sandbox
Merge branch 'kmiya' into sandbox
Linting
Add loader.c
Add header/footer comments
Fallback other loader if loading process fails
Minor fix
Merge branch 'sandbox' into develop
Update version
Rebuild
Use free() indted of stbi_image_free
Merge branch 'develop' into release-0.19
Update manpage
Update README
Merge branch 'kmiya' into sandbox
Merge branch 'sandbox' into release-0.19
Update manpage