sort SKK.jisyo by UTF8 order refs #5
use binary search at dictionary search to make increase speed refs #5

benchmark at iPhone 5S

before:
  2014-10-12 01:20:56.930 FlickSKKKeyboard[902:110633] loaded (5.502137)

after:
  2014-10-12 08:03:08.107 FlickSKKKeyboard[3076:174820] loaded (1.619239)
update CocoaPod