Detect FreeBSD for beginning to suppert it.
Fixed
Remove an extra space
Remove an unnecessary line because already defined in Base class.
Add parentheses according to Ruby Styleguide.
Merge remote-tracking branch 'pr/161/head' into freebsd

Conflicts:
	lib/serverspec.rb
	lib/serverspec/helper.rb
Add freebsd to rakefile
Fix arguments of the methods
Add specs for FreeBSD
Merge branch 'freebsd'
Bump up version