Zk-shell

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Bug Handling
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- json_set was broken for bools

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Bug Handling
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- skip failing tests with zk 3.5.4
- drop support for python 3.3

Features
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- add json_set command

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Bug Handling
~~~~~~~~~~~~

- fix error in copying (Strajan Sebastian Ioan)

Features
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- show connected host in prompt

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Bug Handling
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- update xcmd to fix optional arguments handling

Features
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-

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Bug Handling
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- use the right range for valid_port()
- find shouldn't match the cwd (current working path)

Features
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- `json_dupes_for_keys` now accepts a parameter `first` that includes the
original non duplicated znode

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Bug Handling
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- fix doc error in ``sleep``'s documentation
- fix NameError in xclient when dns lookups fail

Features
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- add ``pretty_date`` option for ``exists`` command
- print zxids in ``exists`` as hex
- all boolean parameters now support a label, i.e.:
``(CONNECTED) /> ls / watch=true``
- new ``time`` command to measure execution (time) of the given commands
- the ``create`` command now supports async mode ``(async=true)``
- print last_zxid in ``session_info`` as hex
- the ``session_info`` commands now has an optional [match] parameter
- new command ``echo`` to print formatted strings with extrapolated
commands