Change terryma/vim-multiple-cursors

Change terryma/vim-multiple-cursors to kristijanhusak/vim-multiple-cursors.

Vim-multiple-cursors conflicts with neocomplete, sometimes I got lots of \<PLUG\> tags when I was using vim-multiple-cursors.
And I find this from google:
https://github.com/joedicastro/dotfiles/issues/12
and
https://github.com/terryma/vim-multiple-cursors/issues/51
So, I change terryma to kristijanhusak. Now, vim-multiple-cursors works fine.