Update Go to 1.5 version

Go is still at 1.3 but 1.4 then recently 1.5 are now available.

Furthermore it improves overall performance (great concurrent garbage collection from 1.5), little langage change make writing and reading go code easier and quicker which is always welcome, plus standard library improvements/bugfixes, see:
https://golang.org/doc/go1.4#language
https://golang.org/doc/go1.5#language

Thanks for these great programming challenges !

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