[cm] Mode fetch example.
[index] Add empty index.html
[index] default layout.
[index] Add vim component.
Merge branch 'index-base' into develop
[cm] Remove vert and horz scrollbars.

Disable vertical scrollbar with .CodeMirror-vscrollbar style.
Disable horizontal scrollbar with lineWrapping.
Merge branch 'cm-vim-style' into develop
[cm] Print command buffer and mode.
Merge branch 'vim-verbose' into develop
[mode] Static mode display.
[mode] Interactive mode display with animation.
[mode] Add kbd to mode display.
[mode] Fix layouts with more flexibility.
Merge branch 'vim-mode' into develop
[meta] Add .gitignore
[meta] Add state-machine.js and credits in README.
[help] First CommandHelp implementation.
[help] Display helps in a single set of commands.
[help] Return to _none state on vim-command-done.

Also refactor CommandHelper by separating fsm part
as another class.
[help] Add state _action to the fsm.