docs: FreeBSD minio source intructions (#1421)

* Modifications of documentation for using and building minio server on FreeBSD.

- update example of enabling compression to use lz4 vs gzip and provide
  explanation of benefits of lz4

- provide walkthrough of building minio server on FreeBSD with binary
  golang and gmake

* Fixing markdown syntax for code blocks so we render correctly.

* typo fix

* reword compression enablement docs for easier reading

FreeBSD.md

@@ -43,11 +43,12 @@ Verify if it is writable
 
 Now you have successfully created a ZFS pool for futher reading please refer to [ZFS Quickstart Guide](https://www.freebsd.org/doc/handbook/zfs-quickstart.html)
 
-However, this pool is not taking advantage of any ZFS features. To create a dataset on this pool with compression enabled:
+However, this pool is not taking advantage of any ZFS features, so let's create a ZFS filesytem on this pool with compression enabled.  ZFS supports many compression algorithms: lzjb, gzip, zle, lz4.  LZ4 is often the most performant algorithm in terms of compression of data versus system overhead.
+
 
 ```
 # zfs create minio-example/compressed-objects
-# zfs set compression=gzip minio-example/compressed-objects
+# zfs set compression=lz4 minio-example/compressed-objects
 ```
 
 To keep monitoring your pool use
@@ -105,3 +106,51 @@ Now you have a S3 compatible server running on top of your ZFS backend which tra
 
 Thanks for using Minio, awaiting feedback :-) 
 
+#### Building Minio Server From Source
+
+It is possible to build the minio server from source on FreeBSD.  To do this we will used the golang distribution provided by the FreeBSD pkg infrastructure.
+
+First we will need to install golang as well as GNU make:
+
+```
+$ sudo pkg install go gmake
+Updating FreeBSD repository catalogue..
+FreeBSD repository is up-to-date.
+All repositories are up-to-date.
+The following 1 package(s) will be affected (of 0 checked):
+
+New packages to be INSTALLED:
+        go: 1.6.2,1
+        gmake: 4.1_2
+
+        The process will require 261 MiB more space.
+        40 MiB to be downloaded.
+
+        Proceed with this action? [y/N]: y
+        Fetching go-1.6.2,1.txz: 100%   40 MiB  10.4MB/s    00:04
+        Fetching gmake-4.1_2.txz: 100%  363 KiB 372.2kB/s    00:01
+        Checking integrity... done (0 conflicting)
+        [1/2] Installing go-1.6.2,1...
+        [1/2] Extracting go-1.6.2,1: 100%
+        [2/2] Installing gmake-4.1_2...
+        [2/2] Extracting gmake-4.1_2: 100%
+```
+
+Next we need to configure our environment for golang.  Insert the following lines into your ~/.profile file, and be sure to source the file before proceeding to the next step:
+
+```
+GOPATH=$HOME/golang; export GOPATH
+GOROOT=/usr/local/go/; export GOROOT
+```
+
+Now we can proceed with the normal build process of minio server as found [here](https://github.com/nomadlogic/minio/blob/master/CONTRIBUTING.md).  The only caveat is we need to specify gmake (GNU make) when building minio server as the current Makefile is not BSD make compatible:
+
+```
+$ mkdir -p $GOPATH/src/github.com/minio
+$ cd $GOPATH/src/github.com/minio
+$ git clone <paste saved URL for personal forked minio repo>
+$ cd minio
+$ gmake
+```
+
+From here you can start the server as you would with a precompiled minio server build.