Update .travis.yml
Merge branch 'master' into travis
Merge branch 'master' into release
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 '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
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 'feature-optimize-data-size' into release-1.3
Rename some functions as snake case
Merge branch 'develop' into feature-verbose-mode

Conflicts:
	src/fromsixel.c
Introduce --verbose option