Renamed gem to allscripts_unity_client.

Implemented following Unity calls:

- GetChangedPatients
- GetChartItemDetails
- GetClinicalSummary
- GetDictionary
- GetEncounterList
- GetMedicationByTransID
- GetPatient
- GetPatientActivity
- GetPatientProblems
- GetPatientByICD9
- GetProvider
- GetProviders
- GetServerInfo
- GetTask