@pombredanne DCO is missing :p , checks might fail

Really looking forward to the new release! Can you please prioritize this @pombredanne?

@sschuberth the current code cannot be released as-is, as the addition of asyncio did speed things up:

• Use async io where possible to improve runtime performance #163 by @netomi

BUT now the code is crashing randomly because of cache inconsistencies:

• Asyncio and multiprocess damage the cache #215

This was cherrypicked, not merged. Closing.