Merge branch 'release-0.19' into release
Bump version
Handle the error if malloc is failed in load_with_gd
Merge branch 'release-0.19' into release-0.20

Conflicts:
	configure.ac
Merge branch 'develop' into release-0.20
Merge branch 'build' into release-0.20
Merge branch 'release-0.20' into release
Rebuild configure script
Merge branch 'gd-integration' into release-0.20
Merge branch 'release-0.20' into release
Merge branch 'release' into develop
Merge branch 'develop' into sandbox
Minor fixes
Add new test image snake.pnm
Update tests
Merge branch 'coverage' into release-0.20
Merge branch 'release-0.20' into release
Merge branch 'release' into develop
Merge branch 'release'
Update coverage status badge