Fix calculated width of prompt with ansi formatting

Add an accessor for the Editor's History.

Fixes #18

Rustfmt

Fix when stdin is not interactive (file or pipe)

Add incremental reverse search

Filename completion

Supported only on Rust Nightly due to unstable features

Using the history.rs example as the de facto example.  Also bumping version number to publish on crates.io

Implement refreshSingleLine & linenoiseEditInsert.