Update index.html

Added menu item for new Scapple shortcuts.
Create scapple.html

Adds keyboard shortcuts for Scapple.
Merge pull request #7 from poritsky/master

Added Shortcuts for Literature and Latte's Scapple Beta
Wrong branch and I'm too lazy not to commit this...
conflict merge
Fixing indentation
Add zsh shortcut cheatsheet
update README
Add tmux cheatsheet, minor update to modifier key symbols
merge