Add some notes on installing on FreeBSD

Could perhaps be expanded with more prose, but this will do for a start.
Fix various typos in markdown documentation
Merge pull request #5948 from bob-smith/spelling_and_typos

Fix various typos in markdown documentation
Refactor the synchronize action plugin and add unit tests
Re-add synchronize unit tests
Merge pull request #5945 from swills/patch-1

Add some notes on installing on FreeBSD
Update bug reporting instructions to refer to the issue template
Micro-optimization of inventory.expand_hosts.detect_range
Micro-optimization: replace s.find(x)!=-1 with x in s

timeit shows a speedup of ~3x on Python 2.7.5 x86_64.
It also makes the code a bit shorter.
hostname module: don't filter hostnamectl with awk

There's no need to filter hostnamectl's output with awk because its man
page says:

    hostnamectl [OPTIONS...] {COMMAND}

       --static, --transient, --pretty
	   If status is used (or no explicit command is given) and one
	   of those fields is given, hostnamectl will print out just
           this selected hostname.

E.g. hostnamectl --static status => ansible.example.org