Log Message:
Update to 2.6.  Notable changes:

Enhancements:
- support for include directive
- added support for HTTPS backends
- support for SNI via multiple Cert directives (thanks to Joe Gooch)

Bug fixes:
- fixed problem with long input lines in http.c
- keep sessions for disabled back-ends, continue using them until the time-out
- fixed memory leak in session removal
- fix for possible request smuggling by using multiple headers
- changed long to long long for support of requests larger than 2GB