Another update

1. 08ab572 limits: Adding support for callback that fired every time a new slot becomes available by Alexander Afanasyev · 12 years ago
2. ccd5bb4 limits: Reverting back renaming of SimpleLimits strategy by Alexander Afanasyev · 12 years ago
3. 7e4235a limits: finalizing rate-based limits by Alexander Afanasyev · 12 years ago
4. 6f95e70 limits: one more update and small interface changes by Alexander Afanasyev · 12 years ago