Add mapping to go to shell from vim

Add this to .bashrc:
PARENT=$(ps | grep $(ps -p $$ -o ppid=) | sed 's/  */ /g' | cut -d " " -f 5 | sed 's/vim/vi/')
if [[ "vi" = $PARENT ]]; then
	PS1="vim -> $PS1"
fi
Make 2 tabs the dafault