Adds support for tabs and semicolons as delimiters

[abtsousa]

Automatically detect the database format using the CSV library's Sniffer class.

Closes #146

[awdeorio]

Thanks for the contribution! I really like the automatic format detection.

I pushed a couple of changes, take a look and see if this still works in your application.

• Read a sample for automatic format detection instead of the whole database file
• Add tests with TSV and semicolon-delimited databases
• Fix failing tests

For the future, reviewing code is a little easier when you use a branch.

[abtsousa]

Thank you so much for your changes, I'm self-taught and still learning the ropes on github so this will help me a lot on how to do things "properly". Everything is working on my end (tried tabs, commas and semicolons and all worked fine on a dry run).

[seshrs]

Thanks for the contribution @abtsousa! And the changes so far look good @awdeorio :)

[awdeorio]

LGTM!