Support :Port as string

When running rackup --port 3333 the :Port option is a string.
Merge pull request #9 from iconara/support_string_port

Support :Port as string
#9 tidy up a bit
remove countdownlatch with signal trap
#2 deploy rack server as a verticle
#2 pass configurations to server verticle
re #2 add number of instances option
fix unit tests
fix integration tests
tweak travis-ci
initialization is much slower
fix logging
fix event bus and clustering
bump to 2.0.0.beta
upgrade jubilee version
Merge branch 'master' of github.com:isaiah/jubilee
add vertx asynchronized httpclient
bump to 2.0.0