Merge pull request #2 from shalako/master

added config.ru for v2 buildpack suppport
Merge pull request #3 from shalako/master

added readme with startup command
Merge pull request #4 from shalako/master

updated readme
Initial commit of service pinger

  A dummy sinatra app
Initial tests for the service pinger sinatra app
happy path and totally sad path
report read and write failures
use guard-rspec
factor out read_metrics and write_metrics
do not leak connections
only pass in new_value
assume Database#test_connection raises
set :error => nil outside
fixes test pollution
Add a web UI to db metrics
add a manifest for the pinger app
added readme
improved readme