working on RFC 6797 HSTS (HTTP Strict Transport Security)
Do not download robots.txt twice for HTTP and HTTPS if --protocol-directories is not given
added support for RFC 6797 HTTP Strict Transport Security (HSTS)
fix possible endless loop in http_parse_param()
added test routine for HSTS feature
added Travis CI .travis.yml
fix .travis.yml
fix .travis.yml
fix .travis.yml
fix .travis.yml, typo in configure.ac string
extended .travis.yml
fixed some minor warnings
fixed minor clang warnings
added Travis CI .travis.yml
fixed some minor warnings
fixed minor clang warnings
updated gettext
fix type naming to mget type naming convention
added plg-config, brushed up configure.ac and Makefiles
Merge branch 'develop' of http://github.com/rockdaboot/mget into develop

er