Made package go-gettable

[belak]

This was really a simple change. I simply:

• made a new directory dendrite inside the root of the repo
• moved the main executable to the dendrite folder
• replaced the local import "./src/dendrite" in the main executable with the full github path.
• moved all files in ./src/dendrite to the root of the repo

If you have any questions or comments, please let me know.

Note: I have no idea how your build script works, but I'm guessing this will break it. Sorry about that. If it's an issue you can't easily fix, I can look into it.

[fizx]

I did make some changes (like moving the command to cmd/dendrite), and did some other work to fix up the build scripts, etc. Useful exercise and pull request.