This is an object representing your Previsto account. You can retrieve it to see properties on the account like its current e-mail address etc. You are allowed to change parameters for your own account only.
The account object also holds information about the user's authorizations in the property 'roles'. There are 2 kinds of roles: (1) system-wide roles and (2) organization-specific roles. System-wide roles are prefixed with ROLE_ and organization-specific roles are prefixed with ORGROLE_followed by the id of the specific organization.