v0.3.0

Refactored Logger & Mailer.
Added configuration options, #configure method & class with specs.
Added Global singleton via DoSnapshot. Now we can use DoSnapshot.logger, DoSnapshot.mailer, DoSnapshot.configure, DoSnapshot.config, DoSnapshot.cleanup.
Added helpers module for DoSnapshot.logger, DoSnapshot.mailer, for access via logger, mailer shortcuts.
Integrated with Aruba tests.
Added Aruba CLI tests for Runner.
Added No keys/token errors.
Added Runner class to easy test with Aruba & RSpec.