Add the missing methods to the user class

* Add Cards: GET
* Add Operations: GET
* Add Personal Operations: GET
* Add StrongAuthentication: CREATE, GET, UPDATE

Ref #2
Update Card delete method.
Add StrongAuthentication Get method
Add StrongAuthentication to Beneficiaries
Update the User Spec to check for IsDocumentsTransmitted of the StrongAuthentication
Add the operations method to the wallets
Add expense sites to the user class
Add operation get method
Add refund method to test class
Add the refund and get_refund method to the Contribution class
Add expense Class with Get method
Add recurrent contribution. It can't be tested for now.
Update the doc of each class and methods. Fixes #5
Add yardoc to gitignore + update README
Add the LEETCHI_API_BASE_URL to the env + update the README to look pretier under YARD
Update the name of the gem to leetchi-wallet-services

* Removed bad characters from withdrawal
* Add developement dependencies
* add the spec to the files
Merge pull request #15 from Leetchi/The-Missing-Calls

Add the missing calls to the Gem + Doc update + Gem Name Update