fix bugs in vimperator hint mode
fix bugs in vimperator hint mode

1. Remove unnessary key binding when enter hint. they are already done
in setupModal. There will be a performance issue after several
rebindings.
2. Vimperator mode's hint chars should be fixed to use A-Z.
3. Fails(also in default mode) if hintChar does not start with A.

Habbie/hammerspoon,chrisjbray/hammerspoon,bradparks/hammerspoon,cmsj/hammerspoon,CommandPost/CommandPost-App,zzamboni/hammerspoon,chrisjbray/hammerspoon,wvierber/hammerspoon,wvierber/hammerspoon,kkamdooong/hammerspoon,lowne/hammerspoon,lowne/hammerspoon,cmsj/hammerspoon,wvierber/hammerspoon,knu/hammerspoon,Habbie/hammerspoon,Hammerspoon/hammerspoon,junkblocker/hammerspoon,lowne/hammerspoon,Hammerspoon/hammerspoon,bradparks/hammerspoon,asmagill/hammerspoon,asmagill/hammerspoon,junkblocker/hammerspoon,wvierber/hammerspoon,latenitefilms/hammerspoon,bradparks/hammerspoon,knu/hammerspoon,asmagill/hammerspoon,Hammerspoon/hammerspoon,kkamdooong/hammerspoon,asmagill/hammerspoon,CommandPost/CommandPost-App,knu/hammerspoon,asmagill/hammerspoon,knu/hammerspoon,knu/hammerspoon,cmsj/hammerspoon,lowne/hammerspoon,zzamboni/hammerspoon,bradparks/hammerspoon,cmsj/hammerspoon,kkamdooong/hammerspoon,chrisjbray/hammerspoon,chrisjbray/hammerspoon,Habbie/hammerspoon,latenitefilms/hammerspoon,latenitefilms/hammerspoon,lowne/hammerspoon,zzamboni/hammerspoon,Habbie/hammerspoon,junkblocker/hammerspoon,cmsj/hammerspoon,chrisjbray/hammerspoon,Habbie/hammerspoon,kkamdooong/hammerspoon,wvierber/hammerspoon,junkblocker/hammerspoon,zzamboni/hammerspoon,Hammerspoon/hammerspoon,Hammerspoon/hammerspoon,CommandPost/CommandPost-App,chrisjbray/hammerspoon,Habbie/hammerspoon,CommandPost/CommandPost-App,junkblocker/hammerspoon,latenitefilms/hammerspoon,latenitefilms/hammerspoon,asmagill/hammerspoon,CommandPost/CommandPost-App,kkamdooong/hammerspoon,knu/hammerspoon,zzamboni/hammerspoon,bradparks/hammerspoon,cmsj/hammerspoon,latenitefilms/hammerspoon,Hammerspoon/hammerspoon,zzamboni/hammerspoon,CommandPost/CommandPost-App