Make Organization API coherent with the SDK

[alexkappa]

Proposed Changes

Make OrganizationManager more coherent by following certain conventions used throughout the SDK. More specifically:

• management.OrganizationBranding: LogoUrl field renamed to LogoURL
• management.OrganizationBranding: Colors type changed to map[string]interface{}
• management.OrganizationInvitation: InvitationUrl field renamed to InvitationURL
• management.OrganizationManager: Create method doesn't clear ID
• management.OrganizationManager: Update method accepts an id parameter as first argument and doesn't clear ID, Name
• management.OrganizationManager: UpdateConnection method accepts an connectionID parameter and doesn't clear ConnectionID, Connection
• management.OrganizationManager: CreateInvitation method accepts an id parameter as first argument and doesn't clear ConnectionID

Acceptance Test Output

$ go test ./... -run TestOrganization                                                                                                                       [16:30:13]
ok      gopkg.in/auth0.v5       (cached) [no tests to run]
ok      gopkg.in/auth0.v5/internal/client       (cached) [no tests to run]
ok      gopkg.in/auth0.v5/internal/tag  (cached) [no tests to run]
ok      gopkg.in/auth0.v5/internal/testing/expect       (cached) [no tests to run]
ok      gopkg.in/auth0.v5/management    3.871s

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