More In-Depth Handling of Job Progress and Detail

- Added more accurately named getJobState methods (which calls existing jobProgress method) to IZencoderClient and ZencoderClient
- Deprecated existing jobProgress methods in favor of getJobState in IZencoderClient
- Added getJobProgress methods to IZencoderClient and ZencoderClient to expose full job progress response
- Exposed getJobDetails method in IZencoderClient interface