Diminish the lighter of guide-key-mode

Diminish it to Ⓖ
Use guide-key-tip to display guide-key in a tooltip

guide-key does not play well with golden-ratio.
also set delay to 1 seconds, can be configured in .spacemacs
for shorter delay
Remove lighter for auto-highlight-symbol
Fixes #40 and #53 Move evil-nerd-commenter to extensions

Work-around a current bug in evil-nc with 24.4 byte-compilation
Fallback to guide-key in a window in terminal
Disable golden-ratio for guide-key buffer