grunt coverage tools
dev metrics script lines/coverage/style
Retry buckets - First changes
Implement retry buckets
retryBuckets module is worker independent
Modify tests in order to be compatible with new the new format of X-relayer-retry header
Send 'Content-Length' header at callback request

On callback request *rush* is always sending payload (errors and complete) with full info about relayed request.

It should (regarding of [rfc2616](http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html)) send this header (at least)

Maybe 'Content-type':application/json should be use instead of default, but I'm not totally sure.
Fix typo
Merge pull request #203 from copitux/patch-1

Send 'Content-Length' header at callback request (Community contrib)
Fix #205. Negative retry values are not accepted anymore
added invalid scenarios for retries
Minor bugfixes. New state retry
Merge branch 'retryBuckets' of github.com:telefonicaid/Rush into retryBuckets
LUA script
retrying state Tests
Use async.whilst instead of setInterval
Merge branch 'retryBuckets' of github.com:telefonicaid/Rush into retryBuckets
Improve log message
Insert some jobs in the queue at the same time
Improve log message on put