Add missing class declaration

README.markdown was missing details about declaring 'my_fw::pre'
and 'my_fw::post' which caused folks following the example to see
the following error:

Could not find dependency Class[My_w::Pre] for Firewall[BLAH]
Merge pull request #109 from dcarley/fix_tests_ruby_193

Fix tests for Ruby 1.9.3 from 3e13bf3
Merge pull request #96 from sfozz/documentation-fixes

Add missing class declaration
Add Puppet 3.1 to travis-ci test matrix

Signed-off-by: Ken Barber <ken@bob.sh>
Merge branch 'maint/master/add_puppet_31_to_travis'

* maint/master/add_puppet_31_to_travis:
  Add Puppet 3.1 to travis-ci test matrix
Mock Resolv.getaddress in #host_to_ip

Add an expect for Resolv.getaddress in Puppet::Util::Firewall#host_to_ip so
that the test can be run when disconnected from the net. Also isolates it
should should puppetlabs.com move to a different address.