Support 15bpp color sixel. (-F option)
Replace indent tabs to spaces.
Remove a trailing space.
Add sixel_dither_unref() before return (-1).
Separate sixel_encode_impl() into sixel_encode_header(), sixel_encode_body() and
sixel_encode_footer().
Remove unnecessary check. (nwrite <= 0)
Merge branch 'arakiken' into arakiken-separate-sixel-encode-impl
Merge remote-tracking branch 'origin/develop' into arakiken

Conflicts:
	src/tosixel.c
Remove a performance hack which inserts '\n' after palette definition.
Suppress GCC 4.9.1 warnings
Revert "Suppress GCC 4.9.1 warnings"

This reverts commit 289b2d7ec4f0e06fe5fc85a8b11eafe536331e04.
Amend fix for suppressing GCC warnings
Remove an extra space.
Allocate 'rgbhit' and 'rgb2pal' on heap instead of stack.
Remove unnecessary variables 'src' and 'orig_src'.
Suppress warings on MinGW environment
Merge pull request #14 from saitoha/arakiken

15bpp color sixel output
Merge branch 'develop' into feature-pipe-mode

Conflicts:
	converters/img2sixel.c
Update .travis.yml