Add keybindings for live coding
e for edit the source block x for executing it
use prefix arguments to scroll by individual lines
When narrowed to a subtree `epresent-run' will restrict the presentation to the current subtree.
Thanks to Geert Kloosterman for this patch.
The default setting hides the mode line, but it can be customized to show whatever one likes.
note that latex image preview may require some additional Org-mode configuration, and the presence of specific commands (e.g. dvipng) on your system