Awslogs

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* Add ``--timestamp`` and ``--ingestion-time`` Thanks vlcinsky 36
* Fix help texts. Thanks Daniel Hahler 46
* Add flake8 to travis

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* Add ``--filter-pattern`` option. 28
* Fix issue with --end default value in Windows 10 x64. 24
* Added support for ``--profile`` 29
* Fix argparse error in Python 3. 31
* Fix some filtering stream issues 32
* Default value for ``--start`` is now 5 minutes instead of 24h.

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* Add some documentation about installing awslogs in "El Capitan"
* Fix 21 - Problems to stop awslogs when pressing Ctrl+C.

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* Fix dependecies so installing awslogs from pypi works again.

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* awslogs now use ``boto3`` instead of ``boto2``.
* awslogs don't longer require ``gevent``.
* massive refactoring of the internals now that ``aws`` provides ``filter_log_events`` out the box.
* awslogs don't longer support retrieving logs from several groups at the same time.
* awslogs now support python: 2.7, 3.3 and 3.4

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* Filter streams by ``start`` and ``end`` in order to reduce the initial volume of queries 9.
* Fix next_token unbound after exception 8