Use 'ntpeters/vim-better-whitespace' to highlite trailing whitespace

The code in 'config/display.vim' did not consistently work
Removes function to remove trailing white space

This is provided in 'ntpeters/vim-better-whitespace' vim plugin
Adds plugin 'vim-scripts/ack.vim'

Use ack within vim
Creates shortcut to add "debugger"
Creates shortcut to add "#QUESTION"
Creates shortcut to add "# TODO"
Set vim transparency to 0

So you don't "see through" the vim terminal. I found this quite
distracting.