[Gravity] Add general database exceptions

Review Request #589 — Created Aug. 22, 2018 and submitted — Latest diff uploaded

pprkut
Lunr
235a53d...
lunr

Add general database exceptions.

Unit tests

src/Lunr/Gravity/Database/Exceptions/QueryException.php
src/Lunr/Gravity/Database/Exceptions/Tests/QueryExceptionBaseTest.php
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