Radical.utils

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- fix: clean ZMQ subscriber and listener threads after fork
- fix: re-enable atfork handlers for os.fork, logging, singleton by default
- PR 216 fix to_tuple
- PR 217 add time simulation class
- PR 218 change ZMQ bulking defaults
- PR 225 add noop() as cb default value
- remove deprecated signals
- reduce log chattiness
- simplify bridge construction

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- add time simulation class
- Travis fix
- silence some debug messages

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- resolve merge mistake

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- fast description base class
- revert to shell based gtod again
- pylint / flake fixes
- add verbosity option to `radical-stack`(192)
- apply exception chaining (23)
- speed up uid generation
- update README

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- convert to Python3
- *drop* support for RU processes and threads
- improve thread lock debugging
- add a `mktar` method
- add daemonization API
- add heartbeat management API
- move ZMQ support from RP to RU
- implement a lazy_bisect algorithm
- implement generic code importer (for RX alg extraction)
- implement progress bar for reporter
- testing, flaking, linting and travis improvements

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- string byteification