Adding custom authentication in Plan methods
Adding custom authentication in Customer methods
Adding custom authentication in Invoice methods
Adding custom authentication in Subscription methods
Adding custom authentication in Payment methods
Update README
Fixing expected return of subscription activate and suspend
Merge branch 'master' into multiple_logins

Conflicts:
	lib/moip-assinaturas/client.rb
	spec/moip-assinaturas/subscription_spec.rb
Merge pull request #6 from viniciusmkm/multiple_logins

Multiple logins