FreeBSD works, and some documentation fixes.

RUNNING.md

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+Running ZeroTier One
+======
+
+This guide is for those building and running from source. See BUILDING.md
+first.
+
+The wiki at GitHub contains several pages that are probably also of interest:
+  https://github.com/zerotier/ZeroTierOne/wiki
+
+### MacOS
+
+On Mac, the default ZeroTier home is:
+
+/Library/Application Support/ZeroTier/One
+
+ZeroTier ships with a kernel extension for its own tap device, which it
+stores in the above directory. To install this, type:
+
+sudo make install-mac-tap
+
+This will create the ZeroTier One home above if it does not exist and install
+the kext there. Note that the kext must be owned by root:wheel. The make
+rule for install-mac-tap takes care of that.
+
+Next, simply run the binary. It must be run as root to open the tap device.
+If run with no options, it will use the default home directory above.
+
+sudo ./zerotier-one &
+
+### LINUX
+
+On Linux, the default ZeroTier home is:
+
+/var/lib/zerotier-one
+
+Just type:
+
+sudo mkdir /var/lib/zerotier-one
+sudo ./zerotier-one &
+
+Your system must have the Linux tun/tap driver available (tun). All tested
+distributions so far ship with this driver as a module that will load
+automatically.
+
+UDP port 9993 must be open in your local firewall for this to work properly.
+How to do this varies by Linux distribution.
+
+ - Opening port 9993 on Ubuntu
+
+Follow the Ubuntu documentation about UFW https://help.ubuntu.com/community/UFW
+
+Check if your UFW is active.
+
+sudo ufw status verbose
+
+If it is active, open UDP port 9993
+
+sudo ufw allow 9993/udp
+
+You should now be able to ping and browse earth.zerotier.net
+
+### FreeBSD
+
+FreeBSD is identical to Linux except that the default home is
+/var/db/zerotier-one instead of /var/lib.
+
+### WINDOWS
+
+Run zerotier-one.exe -h for help. There's a command to install the current
+binary as a service to run it that way, and another option to run it from
+the Windows console.
+
+### Once you're up and running...
+
+To use the command line interface, see this guide:
+  https://github.com/zerotier/ZeroTierOne/wiki/Command-Line-Interface
+
+If you want to test by joining the Earth network, try:
+  sudo ./zerotier-cli join 8056c2e21c000001
+
+An interface called 'zt####' should appear and should get an IP address in
+the 28.0.0.0/7 range (28.* or 29.*) within a few seconds or so. Then try
+pinging earth.zerotier.net or navigating to http://earth.zerotier.net/ in
+a web browser.