Added .dsql and .psql filetypes

[gontadu]

.psql - It appears this is used by PostgreSQL
.dsql - this is used by Microsoft's very own SQL Studio Tools when working with APS/PDW

[msftclas]

Hi @gontadu, I'm your friendly neighborhood Microsoft Pull Request Bot (You can call me MSBOT). Thanks for your contribution!

This seems like a small (but important) contribution, so no Contribution License Agreement is required at this point. Real humans will now evaluate your PR.

TTYL, MSBOT;

[gontadu]

@aeschli Hi, I'm new to this - does the travis-ci check fail mean I need to do something here?

[Tyriar]

@gontadu I think travis is having some issues recently, the failure looks unrelated to your change.

[aeschli]

thanks @gontadu !

[gontadu]

Woohoo!