Added Alt+L and Esc key bindings.
Updated to v0.15.

  * Added a native search mode (using selectize.js's own search/score function).
  * Lazy loading of word hints in native search mode.
  * Adjusted option rendering (added strength_bar visualization.)
  * Added diacritics/accents support in both search mode.
  * Switched selectize.js to my forked version, which maps ss to German sharp s.
  * Fixed the bug that WordModalView doesn't show examples.
  * Hotkey bindings (Alt+L to activate, Esc to exit).