Radical.pilot

- Hotfix release for MPIRUN_RSH on Stampede (572).


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- version bump to trigger pypi release update


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- hotfix to handle broken pip/bash combo on archer


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- hotfix to handle stale ve locks


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- This release contains a very large set of commits, and covers a
fundamental overhaul of the RP agent (amongst others). It also
includes:
- support for agent profiling
- removes a number of state race conditions
- support for new backends (ORTE, CCM)
- fixes for other backends
- revamp of the integration tests


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- hotfix to cope with API changing pymongo release


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