Missing import in "function_example_group.rb"

When mocking facts when testing functions like:
```ruby
let(:facts) { {:ipaddress => '207.130.146.129'} }
```

we get the following error when running rake:
```
NoMethodError:
       undefined method `munge_facts' for #<RSpec::Core::ExampleGroup::Nested_2:0x7fc0934de058>
```

The following must be included in ''function_example_group.rb":
```
include RSpec::Puppet::Support
```