* jobs:
* pass_through_option(), for existing command-line options (1075)
* MRJob.options.runner now defaults to None, not 'inline' or 'local'
* runners:
* all:
* names of uploaded files now never start with . or _ (1200)
* Hadoop:
* log parsing:
* handles more log4j patterns (1405)
* gracefully handles IOError from exists() (1355)
* fixed crash bug in Hadoop FS on Python 3 (1396)
* EMR:
* pooling auto-recovers from joining a cluster that self-terminated (708)
* log fetching uses sudo on 4.3.0+ AMIs (1244)
* fixed broken --ssh-bind-ports switch (1402)
* idle termination script now only runs on master node (1398)
* ssh tunnel connects to internal IP of resource manager (1397)
* AWS credentials no longer logged in verbose mode (1353)
* many option names are now more generic (1247)
* ami_version -> image_version
* accidentally removed ami_version option entirely (fixed in v0.5.5)
* aws_availability_zone -> zone
* aws_region -> region
* check_emr_status_every -> check_cluster_every
* ec2_core_instance_bid_price -> core_instance_bid_price
* ec2_core_instance_type -> core_instance_type
* ec2_instance_type -> instance_type
* ec2_master_instance_bid_price -> master_instance_bid_price
* ec2_master_instance_type -> master_instance_type
* ec2_task_instance_bid_price -> task_instance_bid_price
* ec2_task_instance_type -> task_instance_type
* emr_tags -> tags
* num_ec2_core_instances -> num_core_instances
* num_ec2_task_instances -> num_task_instances
* s3_log_uri -> cloud_log_dir
* s3_sync_wait_time -> cloud_fs_sync_secs
* s3_tmp_dir -> cloud_tmp_dir
* s3_upload_part_size -> cloud_upload_part_size
* num_ec2_instances is deprecated (use num_core_instances)
* ec2_slave_instance_type is deprecated (use core_instance_type)
* hadoop_streaming_jar_on_emr is deprecated (1405)
* hadoop_streaming_jar handles this instead with file:// URIs
* bootstrap_python does nothing on AMI 4.6.0+, as not needed (1358)
* mrjob audit-emr-usage should show less/no API throttling warnings (1091)