Eliminate multiples of Esc keys
^U / ^D to scroll page up / down
Fix for operators + special characters (e.g. 'd~')
Fix backspace in Replace mode (closes #2)
Merge pull request #3 from mkoskar/patch

Eliminate multiples of Esc keys, ^U/^D to scroll page up/down
Better handling of multiple Esc presses
Update README/help