[Profiler] General Improvements

[gregurco]

Todo:

• [x] Collapsible Request and Response section (sometimes there are a lot of data in request/response section and user might want to collapse it) => https://github.com/8p/EightPointsGuzzleBundle/issues/222
• [x] Total requests time on the profiler page (not only in bottom bar). It can be useful in the API projects, because there bottom bar is not used. => https://github.com/8p/EightPointsGuzzleBundle/issues/223
• [x] More detailed request time description: dns lookup time, connection time, etc.. => https://github.com/8p/EightPointsGuzzleBundle/issues/224
• [x] In left menu counter of request can be red if there are failed requests (response status >= 400) => https://github.com/8p/EightPointsGuzzleBundle/issues/225
• [x] If request time is more than expected (should be configurable) then time label should change the color. => https://github.com/8p/EightPointsGuzzleBundle/issues/226

[florianpreusner]

We should split each topic into separate issues later, before starting. Should only be a list of upcoming improvements in general. What you think @gregurco?

[gregurco]

@florianpreusner yep, agree with you :+1:

[florianpreusner]

Extracted all topics into separated tickets. Ticket will be closed.