Merge pull request #20 from rsaarelm/master

Update to latest Rust, fix compiler warning
Use RUSTC env as compiler
Update for rust-nightly
match the result instead of ugly as_ref() call
Fix depreciated warnings: to_owned -> to_string
Fix depreciated warnings: to_owned() -> to_string()
Sync with wycats/rust-toml
Bring back in some of my changes, also fixes build on nightly.
Introduce TableInner. Same as Table(false, _).
Refactor
Refactor and document when certain invalid inserts happen
Fix TableInner handling.

There should be a better way of doing this, i.e. directly modifying
the value instead of the ugly reinsert.
Replace value in-place.
Merge remote-tracking branch 'upstream/master'

Conflicts:
	src/examples/simple/main.rs
	src/testsuite/main.rs
	src/toml/lib.rs