Update .travis.yml
Merge branch 'master' into travis
Merge branch 'master' into release
Fix a double free error
Introduce --enable-debug configure option
Add -Werror to CFLAGS when --enable-debug configure option is specified
Include errno.h in loader.c
Add missing items to NEWS
Merge branch 'release-1.2'
Merge branch 'master' into clib
clib integration: add --with-libcurl option by default
Add libjpeg support with --with-jpeg configure option
Bump version
Merge branch 'hotfix-preventing-double-free' into release-1.2
Merge branch 'feature-warn-missing-images' into release-1.2
Merge branch 'master' into develop
Merge branch 'release-1.2'
Merge branch 'configure-debug-option' into release-1.3
Merge branch 'clib' into release-1.3
Merge branch 'master' into release-1.3