Navigation Hotkeys
==================

Adds new key combinations for easier notebook navigation.

Edit-mode hotkeys:

 * `pageup`        - scroll page up
 * `pagedown`      - scroll page down
 * `Alt`- `+`      - Split cell and keep cursor position
 * `Alt`- `-`      - Combine cell and keep cursor position
 * `Alt`-`n`       - Toggle line number display in current codecell
 * `Shift`-`Enter` - Execute cell, goto next cell and stay in edit mode if next cell is a code cell or unredered markdown cell
 * `Ctrl`-`Enter`  - Execute cell and stay in edit mode if cell is a code cell
 * `Ctrl`-`y`      - toggle celltype between markdown and code

Command-mode hotkeys:

* `esc`      - toggle to edit mode
* `home`     - Go to top of notebook
* `end`      - Go to bottom of notebook
* `pageup`   - scroll page up
* `pagedown` - scroll page down
