[7] Kelp GUI: GUI should use pre-compiled CCXT binary to expand access to exchanges

[nikhilsaraf]

Desired Behavior

I want to be able to run CCXT-rest without having to download and install it for my platform.

Impact

The desired behavior will allow me to run Kelp without the external dependency on CCXT-rest. The pre-compiled binary from Kelp should consist of everything that a user needs to run Kelp with all the features (such as CCXT).

Feature Suggestion

We can achieve the desired behavior by uploading the pre-compiled CCXT-rest binary and download it for our platform when the Kelp UI is first started.

Alternative Approaches

We can achieve the same result by bundling the CCXT-rest binary into the Kelp golang binary using the [pkg](https://github.com/zeit/pkg) tool. We can then use something like [vfsgen](github.com/shurcooL/vfsgen) or [go-bindata](https://github.com/jteeuwen/go-bindata) to bundle up the ccxt-rest binary into the golang binary. Downside of this is that we may need to write this to disk before running it as a process from the os, which is why I'm punting on this approach.

• automate creation of pre-compiled binary for ccxt-rest
• upload pre-compiled ccxt binaries to kelp releases
• GUI server should download pre-compiled ccxt-binary and start process on startup only if not already started