Document IPC XHR API

[trevnorris]

The ipc:// API needs to be fully documented. Especially since Windows requires using http:// instead of ipc://.

The socket-api repo does exist, but it serves as a complete porcelain API. Not just simple examples of how to use the plumbing IPC commands.

Note: After discussion, it was decided that the IPC XHR API would be kept private for the time being. Making it an officially supported API this early would bring a lot of pain in the future. This should still be documented, but the priority has dropped because of this.

[jwerle]

We have it somewhat documented inline in bridge.cc

something official would be great

[trevnorris]

Now that socket-api has been merged into socket, we will consider the IPC XHR API as internal. Hence no need for public documentation.