Xlref

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Fix
~~~
- (doc): Update copyrights.

- (parser): Use `openpyxl` to read excel files instead `xlrd`.

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Feat
~~~~
- (filters): Remove `merge` option in `dict` filter and add list filters
for `key` and `value` options.


Fix
~~~
- (travis): Correct coverage setting.

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Feat
~~~~
- (filters): Add `merge` option in `dict` filter.


Fix
~~~
- (parser): Implement case insensitive parser for sheet names.

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First release.