Version 1 of the new gem!!!

Core Features:
- [x] Authentication: Will use OAuth by deafult. The user will only need to do an setup process to get his client_passphrase.
- [ ] OAuth timeout management
- [ ] Setup scripts: Rails + Non Rails
- [ ] Pagination
 
Resources:
- [x] Users: CREATE, UPDATE, FETCH
- [ ] Wallets
- [ ] Payins
- [ ] Payouts
- [ ] Transfers
- [ ] Transactions
- [ ] Bank Details

Tests:
- [x] Clients
- [x] Users