Limit headers to something below 256kB

I'm not sure behavior is the same for every browser, but at least Chrome has a limit on the total header size (256kB). This causes ajax requests to fail without a clear error.
See issues https://github.com/barryvdh/laravel-debugbar/issues/41 and https://github.com/barryvdh/laravel-debugbar/issues/14
Some results for sizes are here: http://stackoverflow.com/questions/3326210/can-http-headers-be-too-big-for-browsers/3436155#3436155

This limits the max header to 244 kB, so it leaves about 10kB for additional headers.
Off course no data will be received at all, but is probably preferred to a failing ajax request.
Merge pull request #54 from GuimDev/master

Fix mistake (recursion)
Merge pull request #55 from GuimDev/master

Add register_shutdown function is most accurate (and support Twig)
Merge pull request #56 from GuimDev/master

ResponsiveCSS for debugbar
Change minimize to close button

Close the debugbar, to save space. Minimize happens when clicking on the
open tab.
Add error instead of empty array
Look for errors in header data
Merge pull request #50 from barryvdh/patch-1

Limit headers to something below 256kB
Change icon to php-icon
Merge pull request #57 from barryvdh/closebtn

Change close/minimize behaviour
Typo in icons

icone instead of icon
Make dir when not exists
Use HttpDriver in OpenHandler
Prevent opening other directories

Make sure you cannot do something ?id=../somefile
Fix open-btn css

Whoops, trailing comma killed the open button.
Move mkdir to save()
Add Request Method
Add Request Method to collect
Merge pull request #70 from barryvdh/patch-7

Add Request Method to data/open handler
Merge pull request #69 from barryvdh/patch-6

Fix open-btn css