Added a check to make sure that requests that return TOO_MANY_REQUESTS fire onRateLimitReached

It seems that the API is returning the following when the limit is reached:

429:Returned in API v1.1 when a request cannot be served due to the application's rate limit having been exhausted for the resource. See Rate Limiting in API v1.1.(https://dev.twitter.com/docs/rate-limiting/1.1)
message - Rate limit exceeded
code - 88

The code 429 happens to be TOO_MANY_REQUESTS, and it is not handled by the TwitterBaseImpl. I edited the condition to include that code and fire the event onRateLimitReached.

I hope this helps.