Add the missing calls to the Gem + Doc update

Add those missing calls:
* User: cards (get the users cards), operations (get all the operations of the user), operations_from_personal_account (fetch the user operation from his personal account)
* User Strong Authentication: create, get, update
* User Operations
* User Personal Operations
* Beneficiaries Strong Authentication: create, get, update
* Strong Authentication: get (Return an array on all the Strong Authentication request awaiting validation)
* Wallets: operations (Get the wallet operations)
* Transfert Refunds: create, get
* Recurrent Contributions: create, get
* Expense Websites: get
* Expenses: get
* Contribution Refunds: create, get
* Operation: get

This Fixes #2 #4 (Even if it can be improved) 

This Pull request also fixes #5 by adding all of the Gem doc