Add method last_run_logs to pull the puppet logs from last_run_report.yaml and include that in last_run_summary.

More info:
http://projects.puppetlabs.com/issues/22370

I added some tests after seeing a request for them in another pull request.  Hopefully I didn't screw them up, but I did try!  I tried to run them but kept getting: 

[sedge@alucard mcollective-puppet-agent]$ rake
rake aborted!
no such file to load -- mcollective/test
/home/sedge/github/mcollective-puppet-agent/spec/spec_helper.rb:6
/home/sedge/github/mcollective-puppet-agent/Rakefile:77
/home/sedge/github/mcollective-puppet-agent/Rakefile:76:in `new'
/home/sedge/github/mcollective-puppet-agent/Rakefile:76
(See full trace by running task with --trace)

Obvious what the problem is but I didn't know where to get mcollective/test from so I gave up.

Comments/critiques appreciated.