added an exclusion for commons-logging to htmlunit
added velocity dependency
added support for POST in WebServer

GreetingService is now injected into WebServer and used to respond to a
POST request using a Velocity template.
added Logback configuration
implemented greeting result view
Merge remote-tracking branch 'origin/master' into greetingForm
Merge pull request #9 from ceharris/greetingForm

HG-9: greeting form submission