Luqum

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Changed
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- better recursion in the tree transformer util (API Change)

Fixed
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- handling of empty phrases for elasticsearch query builder

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a minor release

Changed
-------

- Better handling of the implicit operator on printing

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Changed
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- Operations are now supporting multiple operands (instead of only two).
This mitigate the construction of very deep trees.

Fixed
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- fixes and improvement of documentation

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Changed
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- The Lucene query checker now checks nested fields before transformation to prevent bad usage

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Added
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- Support for nested fields in Elastic Search queries

Changed
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- improved performances by adding a cache to the tree visitor utility

=================

(Note that 0.2 version was skipped)

Added
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- Transforming Lucene queries to Elastic Search queries
- Added a new tree visitor `TreeVisitorV2` more easy to use

Fixed
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- Improved first tree visitor utility and its tests (API Change)