Fix wrong link in quick.md
Adding isJson and wantsJson to Request

Needs to be documented.
Merge pull request #607 from JesseObrien/patch-2

Adding isJson and wantsJson to Request
Merge pull request #585 from benhanks040888/4.0

Fix wrong link in quick.md
fixing spelling mistakes using aspell

Conflicts:
	billing.md
	homestead.md
	migrations.md
	queues.md
	releases.md
	upgrade.md
Merge pull request #784 from lukearmstrong/4.0

fixing spelling mistakes using aspell
resolve conflict

Signed-off-by: Far Tseng <farrrr@gmail.com>