[WIP] steal all the tests from SHA.jl

[oxinabox]

The tricky part is getting Nettle.jl to establish all the correct answers

[jw3126]

I had mainly

import Nettle

@testset "compare with Nettle" begin
    for offset ∈ [0,10^3, 10^4, 10^5]
        iter = offset:(offset+1000)
        for l ∈ iter
            s = randstring(l)
            @test Nettle.hexdigest("md5", s) == bytes2hex(md5(s))
        end
    end
end

for tests. Something like this makes sure, that all padding scenarios are covered.

[jw3126]

Btw, can you activate travis?

[oxinabox]

I have now added travis. Github was being having issues lastnight and wasn't picking it up (even on a sync).
Nothing will pass until @staticfloat tags a new release of SHA.jl

The SHA.jl tests want to check update! works correctly when called not in isolation.
So I think wrapping Nettle.update! is required.

[jw3126]

Okay sure! My point was its good to cover each case of i = length(data) % 128 for all i in 0:127 in order to test that the padding is correct. I guess we can test all three steps initialization, update! and digest! against nettle.

[oxinabox]

Closed in preference for #3