[keys] Display current mode in the help pane.
[keys] Introduce state machine.
[readme] Add credit to javascript-state-machine.
[keys] implement simple buildKeyMap() in vim.js. closes #2.
[index] Add init.js, rename help.js, and reorder js includes.
[keys] Use keys.js to determine state transition.
[keys] Fix critical logic error in keys.js
[keys] Split state.js to fsm.js and help.js
Merge branch 'vim-keys' into develop