Refactor a bit

[dopplershift]

• Should be one core asana task creation loop
• GitHub- and StackOverflow-specifics should be in classes representing those items that provide appropriate methods to get the information needed
• Would be really nice to have that Asana task loop exist as a single lambda feeding off the SNS pipe, which is powered by StackOverflow and Github specific lambdas. Not strictly necessary since Stack Overflow is just running in a cron job

[dopplershift]

One reason to have the single asana task is that it would limit items needing permissions to the asana credentials.