Integration test

[leodido]

• [x] test both supported drivers
• [x] index documents through Indexer class
• [x] search documents through Search class
• [x] test documentation query example
• [x] test common use cases

The goal is to test real use case SphinxQL queries, completely covering all library code.

[leogr]

Also we have to test strongly all types behaviors. Done for float, missing for integer and bool.

[leogr]

Now types should working properly. @leodido doublecheck pls

[leogr]

We have to check behaviours across sphinx version in order to consider this issue closed.

[leodido]

To check the version we should first check if the command select version(); works.

NOTE: it works in MySQL client only.

[leodido]

Tested with SphinxSearch versions:

• [x] 2.1.6
• [x] 2.1.7
• [x] 2.1.8
• [x] 2.1.9
• [x] 2.2.2-beta
• [x] 2.2.3-beta
• [x] 2.2.4

Ok.