Use f64 instead of float.

`float` has been removed from the language. SQLite documents their REAL type
as being an [f64](), so use that. Exposes a correctness bug where Rust
wouldn't pick f32 as the float type.

[f64] - http://sqlite.org/datatype3.html
Merge pull request #53 from cmr/float-removal

Use f64 instead of float.
Update rustpkg support
Merge pull request #54 from cmr/rustpkg

Update rustpkg support
Add travis-ci status
add .travis.yml
#[crate_type = "lib"];
apt-get install sqlite3
rust-nightly of course
adjust to master
rustpkg directory layout
rustpkg build sqlite
adjust to master
rustpkg install
adjust to master
add test case for #59
print where the unit test segfaults
no Travis emails
adjust to master
4 spaces