Support for multiple custom queries and timestamps without timezone

[math-g]

This is a proposition relative to issues #113 and #103 that I faced on my project. It gives good results on the client setup : large Oracle DB with a lot of views needed and no timezone in timestamps (Oracle DATE type). Multiple custom queries can be configured as views definitions in table.whitelist, without needing rights to add Views to the schema.

Also added support for Postgres blobs in PostgreSql Sink Dialect (BYTEA). See Readme.md for a complete description.

I tried to adhere to existing basecode to add these features cleanly, even if some refactoring would now certainly be necessary (too much arguments in TimestampIncrementingTableQuerier for instance). Also, a better solution concerning escaping in config would need to close previously KAFKA-4524

As written in Readme, I added some unit tests covering these features. Edit 18/03/19 : with Jenkins build reports accessible now, updated the fork to pass all the tests.

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[math-g]

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[mikkin]

Thanks for the PR! I've tagged a few engineers to review further.

[bluemonk3y]

This would be a great feature for scaling connector. Pity it hasn't been completed.

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