See https://github.com/antirez/linenoise/issues/75

Now we can test the Editor!

This reverts commit 00855be3.

The side effect is that manual escape sequences such as ESC-f
must be typed quickly...

Update README for master doc & run test with rust 1.12.0

Update todo list

Completion list is not correctly paged by default.
And add a link to linefeed library.

Update links to docs.rs

Introduce search Direction and killring Mode enums

Introduce Terminal type

Fix #80