Roslibpy

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**Changed**

* Unsubscribing from a listener no longer requires the original callback to be passed.

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**Fixed**

* Fix JSON serialization error on TF Client (on Python 3.x).

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**Added**

* Add support for IronPython 2.7.

**Changed**

* Handler ``on_ready`` now defaults to run the callback in thread.

**Deprecated**

* Rename ``run_event_loop`` to the more fitting ``run_forever``.

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**Fixed**

* Minimal documentation fixes.

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**Added**

* Initial version.