Rewrite crate with serde support from ground up

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

1 files changed, 3 insertions, 13 deletions

diff --git a/tests/invalid.rs b/tests/invalid.rs
index 63e4de8..4679684 100644
--- a/tests/invalid.rs
+++ b/tests/invalid.rs
@@ -1,17 +1,9 @@
 extern crate toml;
 
-use toml::{Parser};
-
 fn run(toml: &str) {
-    let mut p = Parser::new(toml);
-    let table = p.parse();
-    assert!(table.is_none());
-    assert!(p.errors.len() > 0);
-
-    // test Parser::to_linecol with the generated error offsets
-    for error in &p.errors {
-      p.to_linecol(error.lo);
-      p.to_linecol(error.hi);
+    println!("test if invalid:\n{}", toml);
+    if let Ok(e) = toml.parse::<toml::Value>() {
+        panic!("parsed to: {:#?}", e);
     }
 }
 
@@ -32,8 +24,6 @@ test!(datetime_malformed_no_secs,
       include_str!("invalid/datetime-malformed-no-secs.toml"));
 test!(datetime_malformed_no_t,
       include_str!("invalid/datetime-malformed-no-t.toml"));
-test!(datetime_malformed_no_z,
-      include_str!("invalid/datetime-malformed-no-z.toml"));
 test!(datetime_malformed_with_milli,
       include_str!("invalid/datetime-malformed-with-milli.toml"));
 test!(duplicate_keys,