Merge branch 'travis' into configure-gdkpixbuf
Merge branch 'release-0.19'
Merge branch 'develop'
Merge branch 'develop' into manpage
Merge branch 'release-0.19'
Add PNM loader imported from kmiya's sixel
Enable pnm format loader in loader.c
Minor fix
Build with frompnm.c
Don't use stbi_load_from_file
Add functions detect pnm/sixel image format
Do not use stbi loader if image format is pnm/sixel
Minor fix
Merge branch 'fix-segfault-without-arguments' into develop
Update minor version
Merge branch 'issue-2' into release-0.19
Rebuild configure script
Merge branch 'configure' into release-0.19
Merge branch 'release-0.19'
Fix for some environment lacks memory.h