Bug: extra character selected by triple-click

[Huy]

Hello,

I get different behaviors when triple-mouse-clicking on a line of text.
- in gvim, the line is highlighted and the cursor is put on the character closest to the mouse click point.
- when in emacs-mode, the line is highlighted and the cursor is put on the first character of the next line.
- when in vimpulse-mode, the "line PLUS the first character of the next line" are highlighted and the cursor is put on the first character of the next line.

Vimpulse's bug is bad because if you then hit 'x', you will see that the first character of the next line is deleted as well as the the triple-clicked line.

This also causes problems in org-mode when I select multiple lines and, for example, try to do things like convert between headline and list.

Thanks for looking into this and awesome work guys!  I love vimpulse.
Huy