Pybraries

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* fix filter kwargs

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* remove stdout from project_search

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* Fix regression bug in kwargs

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* project_search. Other project_search functionality with platforms regression fixed.

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* Fixed bug in project_search. Now pass keywords="my keywords to search" as an argument. Must be passed as a keyword argument.

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* Refactored code - (thanks victorgveloso!)
* Fixed naming divergences between libraries.io API and pybraries (manager->platform and package->project)