Sparts

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* PATENTS: Updated to version 2 (http://fb.me/patents2)
* CPPServerTask: new module sparts.tasks.thrift.cppserver uses TCppServer wrapper from fbthrift
* ThriftServer: support for TMultiplexedProcessor in server via MULTIPLEX=True
* ThriftClient: support for TMultiplexedProtocol in client via `multiplex_service` kwarg
* fileutils: added `readfilebytes`, `writefilebytes` for raw binary bulk IO
* SelectTask: play more nicely with frameworks that steal sys.stdout
* DirectoryWatcherTask: log warning instead of crash if directory doesn't exist
* ThriftClient: detect usage errors in constructor more easily
* bugfix: fix sparts.thrift.compiler.compile() convenience method
* Split sparts.tasks.thrift into submodules, handler, server, nbserver

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* bugfix: Unbreak default values for VService options with names with underscores
* bugfix: Improve stability of dbus implementation with multithreading
* PeriodicTask.execute_async(): returns a future that succeeds or raises upon successful
completion (or an exception occurs) in the next execute call.
* dbus: Allow dbus to be used (e.g., for signal handling) even if thrift isn't installed
* dbus: Added support for system bus by passing --{task}-system-bus
* TryLater.after: implement after kwarg to TryLater to wait seconds before retrying (PeriodicTask)
* Updated six dependency to require >= 1.5.0

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* bugfix: pypi 0.7.0 release has broken logging due to uncommitted changes. Use 0.7.1 instead.
* VService.DEFAULT_LOGFILE and --logfile option to log to a file instead of stderr
* bugfix: race condition in tasks.select popen helpers bay result in false negative result
* bugfix: VTask.OPT_PREFIX can now contain "-"
* `sparts.tasks.tui` introduces a UITask suitable for building npycurses UIs that play nicely with sparts
* `sparts.collections` introduces a PriorityQueue and UniqueQueue
* `sparts.tasks.select` introduces a SelectTask, helpers for working with Popen
* `sparts.tasks.queue` introduces a PriorityQueueTask and UniqueQueueTask

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* Fix vservice initialization when daemonize is not installed
* Add `map` and `submit` API to QueueTask

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* Support for POSIX daemonization helpers (--daemonize, --kill, --status, etc) if `daemonize` is installed.
* ThriftHandlerTask subclasses now verify it implements MODULE.Iface
* `QueueTask` new counters: queue_depth, n_trylater, n_unhandled, n_completed, execute_duration_ms
* Add http-based thrift support to sparts.thrift.client
* Tasks now accessible via attributes on `service.tasks` by name and via `get()` and `require()`
* Fixed a race condition in deferred errback handling in QueueTask
* ExecuteContext (for QueueTask) now supports a `future` keyword argument.
* `sparts.timer` with `Timer` class for tracking timings
* `sparts.counters.Callback` counter that take a callback to be called to return the value.
* Better support for counters defined in `initTask()` (instead of declaratively)
* New function: sparts.timer.run_until_true(f, timeout)
* Improved unittest stability
* Improved support for v6
* Improved support for fbthrift

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* Renamed FB303ProcessorTask to FB303HandlerTask
* NBServerTask can now specify a MODULE to dictate which thrift handler task should be used
in the event that more than one has been registered.
* Changed thrift handler semantics: you must set a MODULE instead of PROCESSOR on things now