plugin/grappele.vim: Fix performance issue with `G`

Looked into the performance issues I was having with the `G` command.
After a little profiling and then messing around with

    let start = reltime() | <do stuff> | echom reltimestr(reltime(start))

Using the `reltime` method I discovered that `grappele#Grappele()` was
running pretty quick (~60 time units). I then ran it around the

    :<c-u>call grappele#Grappele(v:count)<cr>

part of the mapping and found that it took about 130 time units.

Then doing

    nnoremap G :let start = reltime() \| execute 'normal! G' | echom reltimestr(reltime(start))

was pretty quick.

With that information, I decided to try a direct mapping bypassing the
`<Plug>` mapping just to see what that would do. Turns out the custom
`G` command works much faster with this method for some reason. In terms
of feel it's as fast as the normal `G` command.

Replacing the `<Plug>` mapping with the direct one for speed. Not really
sure what the reason for this is but I'm glad the performance is up to
snuff and actually usable now.

I'm testing this on OS X 10.8.5 with the stock Vim (7.3 (2010 Aug 15,
compiled Jun 20 2012 13:16:02)). Also noticed this issue on my Debian
server which I just found out uses the same version of Vim (7.3 (2010
Aug 15, compiled May  4 2012 04:25:35)).

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