Update .travis.yml
Merge branch 'master' into travis
Merge branch 'master' into build
Introduce --enable-debug configure option
Add -Werror to CFLAGS when --enable-debug configure option is specified
Merge branch 'master' into clib
clib integration: add --with-libcurl option by default
Add libjpeg support with --with-jpeg configure option
Merge branch 'master' into develop
Merge branch 'configure-debug-option' into release-1.3
Merge branch 'clib' into release-1.3
Merge branch 'master' into release-1.3
Merge branch 'feature-libjpeg-integration' into release-1.3

Conflicts:
	converters/Makefile.am
	converters/Makefile.in
Suppress gdk-pixbuf assersion on processing some GIF images, reported by
@ttdoda
Merge branch 'master' into fix-suppress-gdk-pixbuf-assersion
Strip an extra LF character from output data
Strip an extra DECGNL character at the end of output data
Omit DCS parameters by default
Merge branch 'master' into develop
Update README