Re-export public functions of the find module.

[rbost]

Fixes #203

[jmcconnell26]

This looks good to me, @rbost, do you think there is any other functionality that shouldn't have been made private?

[rbost]

I don't think the code in geiger_syn_visitor.rs is meant to be public, and no other function from find.rs was public, so I don't think so.
But don't take my word for granted: I am not a real user of this crate.

[jmcconnell26]

OK, then let's keep the accessibility of everything else the same.

[anderejd]

Should this be published as 0.4.7 or 0.5.0?

[rbost]

I has to be 0.4.7, for two reasons:

1. A minor one: it just adds features, without breaking one and hence, is a minor change (at least according to Cargo's documentation.
2. A major one: Cargo's dependency resolution algorithm would consider 0.4.6 and 0.5.0 as incompatible versions (see here, second paragraph), and not will not update the crate, making the API break essentially permanent unless dependent crates explicitly update the minimum required version.

[anderejd]

Thanks for the information!

0.4.7 is up https://crates.io/crates/geiger/0.4.7