This commit completely rewrites this crate from the ground up,
supporting serde at the lowest levels as I believe serde support was
intended to do. This is a major change from the previous versions of
this crate, with a summary of changes being:
* Serialization directly to TOML is now supported without going through
a `Value` first.
* Deserialization directly from TOML is now supported without going
through a `Value`. Note that due to the TOML format some values still
are buffered in intermediate memory, but overall this should be at a
minimum now.
* The API of `Value` was overhauled to match the API of
`serde_json::Value`. The changes here were to:
* Add `is_*` accessors
* Add `get` and `get_mut` for one-field lookups.
* Implement panicking lookups through `Index`
The old `index` methods are now gone in favor of `get` and `Index`
implementations.
* A `Datetime` type has been added to represent a TOML datetime in a
first-class fashion. Currently this type provides no accessors other
than a `Display` implementation, but the idea is that this will grow
support over time for decomposing the date.
* Support for the `rustc-serialize` crate has been dropped, that'll stay
on the 0.2 and 0.1 release trains.
* This crate no longer supports the detection of unused fields, for that though
you can use the `serde_ignored` crate on crates.io
This test shows that in some cases converting error offsets generated by
the parser to line and column numbers will panic ('arithmetic operation
overflowed') in debug mode, and return an incorrect column number in
release mode.
* Key names are restricted to [a-zA-Z0-9_-]
* Equal signs must be on the same line (as must the next value) as the key
* Quoted keys are allowed and are parsed as basic strings.
Closes#48
