[vim/spell] Update spellings file
[vimrc] Update wildigore wildcards. Also manage latex-suite through Vundle
[vimfiles.sh] Fix shell script to i nstall vimfiles

The old shell script had loads of issues. Fixed them all.

1. The script checked for .vim as a file rather than directory and hence missed
it.
2. The script did not include Vundle at all. Making it impossible to install any
other plugins.