Es2csv

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- Added JSON validation for raw query. (Issue `7 <https://github.com/taraslayshchuk/es2csv/issues/7>`_)
- Added checks to exclude hangs during connection issues. (Issue `9 <https://github.com/taraslayshchuk/es2csv/issues/9>`_)
- Updating version elasticsearch-py to 2.4.0 and freeze this dependence according to mask 2.4.*. (Issue `14 <https://github.com/taraslayshchuk/es2csv/issues/14>`_)
- Updating version progressbar2 to fix issue with visibility.

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- Added option to read query string from file --query(-q) '~/filename.json'. (Issue `5 <https://github.com/taraslayshchuk/es2csv/issues/5>`_)
- Added --meta_fields(-e) argument for selecting meta-fields: _id, _index, _score, _type. (Issue `6 <https://github.com/taraslayshchuk/es2csv/issues/6>`_)
- Updating version elasticsearch-py to 2.3.0.

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- Added --raw_query(-r) argument for using the native Query DSL format.

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- Fixed support elasticsearch-1.4.0.
- Added --version argument.
- Added history changelog.

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- Fixed encoding in CSV to UTF-8. (Issue `3 <https://github.com/taraslayshchuk/es2csv/issues/3>`_, Pull `1 <https://github.com/taraslayshchuk/es2csv/pull/1>`_)
- Added better progressbar unit names. (Pull `2 <https://github.com/taraslayshchuk/es2csv/pull/2>`_)
- Added pip installation instruction.

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- Initial registration.
- Added first dev-release on github.
- Added first release on PyPI.