Upgrade hystrix to 1.4.4

[spencergibb]

It includes changes to the dashboard and proxy servlet:
https://github.com/Netflix/Hystrix/blob/master/CHANGELOG.md

[spencergibb]

wait to merge a765839 until we have something with an RC

[dsyer]

RC for what? Why do we need to wait?

[spencergibb]

just worried about changes to the dashboard that haven't really been tried out yet. If you're ok, I'll merge.

[dsyer]

Let's ask @royclarkson or someone to try his dashboard. I assume our sample works because a user asked for this?

[spencergibb]

someone noted that 1.0.0 used 1.4.0.RC of hystrix, 1.0.1 snapshot already has hystrix 1.4.1. I noted the latest was 1.4.4 and had dashboard changes that we should bring along.

[spencergibb]

one of the changes was to ignore a header, that was my big worry

[spencergibb]

From stackoverflow: http://stackoverflow.com/questions/29622871/spring-cloud-hystrix-dashboard-not-working-with-oauth

[royclarkson]

I'm working on testing my changes (using the latest snapshot) in PCF today. What's the issue with the transfer encoding header?

[spencergibb]

@royclarkson Netflix/Hystrix#671