Log Message:
Update Go to 1.6.

The latest Go release, version 1.6, arrives six months after 1.5. Most of its
changes are in the implementation of the language, runtime, and libraries.
There are no changes to the language specification. As always, the release
maintains the Go 1 promise of compatibility. We expect almost all Go programs
to continue to compile and run as before.

The release adds new ports to Linux on 64-bit MIPS and Android on 32-bit x86;
defined and enforced rules for sharing Go pointers with C; transparent,
automatic support for HTTP/2; and a new mechanism for template reuse.

Full changelog at https://golang.org/doc/go1.6.