Use a Different Zip Crate for Decompression

[lolpro11]

Hi,
On PR #153 @Tristramg mentioned support of various zip compression methods that are not used in Zip.
@kylerchin also mentioned the use of LZMA Nested Feeds in SEPTA's GTFS Feed.

Do we have any ideas for an alternate crate?
Thanks.
Edit: Looks like no current GTFS provider has compressed their feed using anything other than store or deflate.
#153 (comment)

[kylerchin]

The user should handle edge cases where there are nested zip libraries.

[lolpro11]

The user should handle edge cases where there are nested zip libraries.

Example:

let (gtfs_bus, gtfs_rail) = GTFS::from_multizip()

Still user directed, but for cases like SEPTA where it might be useful for testing in cargo test
A better idea would be returning a Vec with the GTFS structs because my example would only return the 2 GTFS structs.

[kylerchin]

It is a single agency and the library should not be changed to accommodate a single agency's poor file distribution.