Update to vimsetup.sh

Added line:
    [ ! -d ${HOME}/.vim/backup ]; mkdir -p ${HOME}/.vim/backup;

to avoid write complaints in Vim with the backup directory missing.
Committed by Carey McLelland
On branch titan
Changes to be committed:
	modified:   vimsetup.sh

Summary of changes:
	Introduced mkdr() function to clean up the script a little bit, and to remove an
ugly series of if [ ! -d $directory ] statements.
Changes to be committed:
	deleted:    vimsetup.sh
Changes not staged for commit:
	modified:   install.sh

Merging vimsetup.sh to install.sh so there is only one script.
On branch titan
Changes to be committed:
	modified:   install.sh

Summary of change(s):
    Commiting the work in progress changes of the install.sh merge.