Add flags for including stdout/stderr in the API response.
Minor node registry cleanup.
Refactor and improve testing for tron.commands.client.
Update commands and display to use the new client.
Restrict number of job runs on the server.
Fix actiongraph view for tronweb job_run.
Merge branch 'release_0.6.1' of github.com:Yelp/Tron into 0.6.1_command_client_interface
Merge branch 'r0.6.1_output_stream_serializer_cleanup' of github.com:dnephin/Tron into 0.6.1_command_client_interface
Merge branch 'release_0.6.1' of github.com:Yelp/Tron into 0.6.1_command_client_interface

Conflicts:
	tron/api/adapter.py
	tron/api/www.py
	tron/core/actiongraph.py
	tron/node.py
Update tronweb to use the new flags.
Merge branch 'yelp_hackathon_10' of github.com:dnephin/Tron into 0.6.1_command_client_interface
Merge branch 'release_0.6.1' of github.com:Yelp/Tron into 0.6.1_command_client_interface
Merge branch 'release_0.6.1' of github.com:Yelp/Tron into 0.6.1_command_client_interface
Fix formatting.
Merge pull request #226 from dnephin/0.6.1_command_client_interface

command client interface