Implement Extendable and FromIterator for TreeMultiset
Rename src/rust-multiset.rs to src/mod.rs (I found the path option in Cargo\!)
Add is_superset method (provided) to Multiset trait
Add my real name to Cargo.toml
Add Makefile, which is used for testing
Add gitignore
Add a provided method, insert_one, to MutableMultiset