Diesel: Let's make sure adding custom SQL types out of crate is a reasonable experience

[sgrif]

This likely just requires cleaning up and exposing the macros in types/imps/mod.rs, and writing up a documentation page on how to do this.

[sgrif]

This is the main focus of 1.1

[sgrif]

It's done.

[sunshowers]

Hi @sgrif -- you mentioned that there would be a doc page on how to do this. I looked for it but couldn't find it -- could you link to it?

[sunshowers]

OK, I found https://github.com/diesel-rs/diesel/blob/master/diesel_tests/tests/custom_types.rs. Looks promising.