add unit tests for Ping model and setup rails env for TravisCI
update Gemfile to Rails 4.
removed newrelic_api gem since it had a hard dependency on rails 3.0.7
https://github.com/newrelic/newrelic_api/blob/619595fe0e0b350248c9e26136afb516cc5f24ef/newrelic_api.gemspec
setup the envs with the default rails 4 configs
load schema since "schema.rb" is in the git repo
tell rails prod env to serve static assets
correctly reference images in CSS according to rails4
rename model method to current_time
silence secret_key_base warnings in the test env
remove Ping#current_time and revert back o Time.now.
cover method revert by adding time cop.
restructure travis.yml file. added bundle exec to rake db:schema:load
add jquery back in
Merge pull request #17 from westonplatter/rails4

upgrade to rails 4 + testing