Merge branch 'develop' into release-0.19
Update minor version
Update configure script
Minor fix
Merge branch 'sandbox' into configure

Conflicts:
	configure.ac
Update manpage of img2sixel
Fix for environments that do not have pkg-config
Improve configure script avilability
Update build scripts
Merge branch 'fix-if-pkgconfig-is-unavilable' into configure
Merge branch 'configure' into kmiya
Merge branch 'kmiya' into sandbox
Merge branch 'sandbox' into release-0.19
Bump version
Rebuild configure script
Merge branch 'release-0.19' into develop
Issue #2 Fix segmentation faults caused when
libcurl integration is enabled
Update manpage of img2sixel
Merge branch 'fix-segfault-without-arguments' into develop
Merge branch 'develop' into manpage