Log Message:
Update ruby-http to  0.9.8.

## 0.9.8 (2015-09-29)

* [#260](https://github.com/httprb/http/pull/258):
  Fixed global timeout persisting time left across requests when reusing connections.
  ([@zanker][])

## 0.9.7 (2015-09-19)

* [#258](https://github.com/httprb/http/pull/258):
  Unified strategy for handling exception-based and exceptionless non-blocking
  I/O. Fixes SSL support on JRuby 9000. ([@tarcieri][])

## 0.9.6 (2015-09-06)

* [#254](https://github.com/httprb/http/pull/254):
  Removed use of an ActiveSupport specific method #present?
  ([@tarcieri][])

## 0.9.5 (2015-09-06)

* [#252](https://github.com/httprb/http/pull/252):
  Fixed infinite hang/timeout when a request contained more than ~16,363 bytes.
  ([@zanker][])

## 0.9.4 (2015-08-26)

* Fixes regression when body streaming was failing on some URIs.
  See #246. (@zanker)
* Fixes require timeout statements. See #243. (@ixti)

## 0.9.3 (2015-08-19)

* Fixed request URI normalization. See #246. (@ixti)
  - Avoids query component normalization
  - Omits fragment component in headline

## 0.9.2 (2015-08-18)

* Fixed exceptionless NIO EOF handling. (@zanker)

## 0.9.1 (2015-08-14)

* Fix params special-chars escaping. See #246. (@ixti)

## 0.9.0 (2015-07-23)

* Support for caching removed. See #240. (@tarcieri)
* JRuby 9000 compatibility