Remove addl template feature, improve docs

- Remove attribute for additional templates. You should now call `logstash_` LWRPs directly to get this functionality back.
- Remove automatic inclusion of `platformstack` cookbooks. These should be called by a downstream wrapper.
- Better documentation for java requirement, Berkshelf requirements, and keypair requirements for Lumberjack. Fixes https://github.com/rackspace-cookbooks/elkstack/issues/57.
Remove unused variable
Remove unused resource, converge monitors for test
Converge with platformstack monitors so that notifying resources isn't a chef-client error
Converge monitors and logging before elkstack
Remove direct calls to platformstack

With platformstack now allowing custom monitors by modifying attribute data, remove direct calls to platformstack.
Template names changed slightly with new formatting
Merge pull request #59 from martinb3/master

Remove addl template feature, improve docs