Be polite to APIs

[Hritik14]

• Respect rate limits
• Global gentle 1s (or so) delay
• Delays based on last visits

This could be done by implementing functions like vulnerablecode.get(url...)

[pombredanne]

No function should ever make a request of its own.
We should always have a central place called from where we will be able to implement politeness and logging and retries, and so on.