Add rake, rspec dev-depds
Add rspec rake task
Make config_file optional
Add spec without api key
Ad travis config
Majore refactoring

- Introducing storage class
- Introducing service class (plugin + config)
Drop service, just use plugin
restructure
Move factories to plugin/storage
Move interruptible sleep out of bipbip
Warning if no storages or services configured
Merge branch 'master' of github.com:cargomedia/bipbip into issue-37

Conflicts:
	lib/bipbip/plugin.rb
Adjust error msg
Introduce storage.store_sample method
Move frequency check into copperegg
Simplify warning IFs
Cast config to hash
Underscore "private" functions
Move plugin and storage instantiation into load_config
Move logger configuration into load_config