binary release fixes + install info

[joehand]

Finishing support for Dat binary releases! The last issue is getting UTP native included in the release. Right now pkg doesn't support including native modules in the package, so we'll put the binary plus .node file together in a folder for folks to download.

• get WASM builds in binary
• add native modules to travis release thing
• add install info to readme
• add download button to docs
• write basic install script (?)

ARM builds have a few blockers:

• https://github.com/zeit/pkg-fetch/issues/31
• (another issue I need to find)

[joehand]

(will add download button once we can get that .node file included.

[TemaSM]

@joehand What about Win ia32 prebuild? I think, that not only I need it.
Cannot compile utp-native and bundle it with dat Windows x86 built binary, using Nexe or pkg as packaging tool.
Will appreciate you so much for any advice on how to make build dat for Windows x86 with utp-native.

UPD: Figured out what was wrong and compiled successfully using pkg, but now I should provide not just binary, but .node native along with it, not excellent as Nexe, but Nexe doesn't wanna work fine with dat.

[joehand]

Great you got it working! Including win 32 build is okay with me, feel free to PR the necessary additions to support that.

Figured out what was wrong and compiled successfully using pkg, but now I should provide not just binary, but .node native along with it, not excellent as Nexe, but Nexe doesn't wanna work fine with dat.

Ya it's a bit tricky. I tried both for awhile and pkg was much easier in the end except for the native module part. We are hoping eventually we can also bundle the .node files: vercel/pkg#329