Radical.entk

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- fix executable value check
- Fix outdated command and session name
- pep8
- allow str, unicode and None for executable
- executable list -> scalar

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- add travis support (pytest, coverage, flake8, pylint)


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* Issues resolved in 0.7.17 milestone:
https://github.com/radical-cybertools/radical.entk/milestone/15
* support pipeline suspend and resume


Changelog for 0.7.14+0.7.16 (hotfix)

* Issues resolved in 0.7.14 milestone:
https://github.com/radical-cybertools/radical.entk/milestone/14
* Bug fixes and updated documentation


Changelog for 0.7.12+0.7.13 (hotfix)

* Issues resolved in 0.7.12 milestone:
https://github.com/radical-cybertools/radical.entk/milestone/13
* Fixed bug in task manager where there were some elements blocking the pika communication loop
* Improved documentation

* Issues resolved in 0.7.11 milestone:
https://github.com/radical-cybertools/radical.entk/milestone/12
* Separated the CU creation from RMQ Communication thread

* Issues resolved in 0.7.9 milestone:
https://github.com/radical-cybertools/radical.entk/milestone/11?closed=1
* Included ability to suspend and resume pipeline execution
* Several bug fixes

* Hotfix for issue 259