Backport console fixes to v2.1

Backport reflash fix to v2.1.2

Merge pull request barryvdh#433 from kwoodfriend/patch-1

Fix for Laravel 5.2 event changes

Update Debugbar.php

Update checks

Extend Controller when possible

Merge pull request barryvdh#360 from JerseyMilker/make-session-default

Default enable session collector.

Rename LaravelDebugBar.php to LaravelDebugbar.php

Fixes barryvdh#303 caused by barryvdh#302

Detect app.debug if enabled is null

Fixes barryvdh#285
It cannot be guaranteed that app.debug is loaded before debugbar.

Swap register/boot order