Added MikroTik installation guide. No print version PDF yet.

Added two new documents that comprise the MikroTik installation guide. The "Install on a MikroTik router" and "MikroTik Installation Server Setup" guide. Both are "wall of text", but unfortunately that is what is needed for the MikroTik stuff.

@dismantl @jheretic @critzo - please take a look and merge when ready!