Mirakuru

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- [enhancement] when killing the process ignore OsError with errno `no such process` as the process have already died.
- [enhancement] small context manager code cleanup

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- [bugfix] atexit cleanup_subprocesses() function now reimports needed functions

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- [bugfix] Handle IOErrors from psutil (112)
- [bugfix] Pass global vars to atexit cleanup_subprocesses function (111)

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- [feature] Kill all running mirakuru subprocesses on python exit.
- [enhancement] Prefer psutil library (>=4.0.0) over calling 'ps xe' command to find leaked subprocesses.

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- [feature] HTTPExecutor enriched with the 'status' argument.
It allows to define which HTTP status code(s) signify that a HTTP server is running.
- [feature] Changed executor methods to return itself to allow method chaining.
- [feature] Context Manager to return Executor instance, allows creating Executor instance on the fly.
- [style] Migrated `%` string formating to `format()`.
- [style] Explicitly numbered replacement fields in string.
- [docs] Added documentation for timeouts.

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- [refactoring] Moved source to src directory.
- [fix, feature] Python 3.5 fixes.
- [fix] Docstring changes for updated pep257.