* Remove rustc_serialize support
* Add changelist and bump version number for alpha
* Move refbox and friends into own module
* update changelog
* update travis config
* move serde functions out into global namespace
* Update to serde_derive
* Fix missing Encoder and Decoder imports
* Add test for serializing bytes
* More efficient serialize_bytes
Reported in #serde: blank_name2 tried serializing
`HashMap<String, HashSet<Bytes>>` vs `HashMap<String, HashSet<&Path>>`,
the `&Path` version was done in ~.6 seconds while the
`&[u8]` one took a full 3 seconds more.
* Delegate emit_enum_struct_variant calls to emit_enum_variant
read_enum_struct_variant delegates calls to read_enum_variant which
expects u32 prefix to encode a variant number. Previous implementation
of emit_enum_struct_variant doesn't emit it, making serialized data
invalid.
* Add test to check manual enum encoding
* Removed unused import warning
* pub use InvalidEncoding in serde+rustc_serialize
* Made both fields of InvalidEncoding public so it can be used without Display or Debug traits (e.g. pattern matching)
* Export of InvalidEncoding in rustc_serialize/serde make them visible in `cargo doc`