Jsail

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* Argument ``--fields`` was added. You can use it to specify which fields
should be printed to stdout. By default, all fields are printed.
* Fixed error with parsing entries where fields contains ``time`` key
with non string value.

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* Now jsail searches fields dict not only in key ``fields``, but also
in ``fields``.
* Fixed precendence of fields searched for item's timestamp. Previously,
item found in ``timestamp`` can be overwritten by value from
``time``. Now these fields are searched in this order and first found
value is used:

- ``timestamp``
- ``timestamp``
- ``time``
- ``(fields | fields).timestamp``
- ``(fields | fields).time``

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* Unbuffered stdin usage was fixed and now program
exists correctly if it encounter EOF.

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* Now jsail recognizes as timestamp keys ``timestamp``,
``time``, ``fields.timestamp``, ``fields.time``.
And similarly, for message these keys are checked:
``message``, ``msg``, ``fields.message``, ``fields.msg``.
* Now jsail quietly skips lines which can't be parsed
as single JSON document.

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* Fixed issue with STDIN bufering. Previously,
input given from STDIN was buffered and sometimes
``jsail`` didn't show content until buffer fills up.
Now this behaviour is fixed.

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* 'anyjson' was added into the requrements list.
* Now jsail will process STDIN if filename wasn't given as a command line argument. This makes possible to use it in unix pipelines.