add option to log in with long-term api key
add jobs#task_status and jobs#get_transcript methods
add comment about api_key option in client#configure
add options hash param to perform_transcription method
include error type in exception
use new task_status method in task_complete? method
add basic tests for job_info, task_status, and get_transcript
remove Cielo24 error type from exception, its actually not that useful
revert to double quotes for error status access
update readme with new methods
Merge branch 'zackm-more_jobs_methods'