.bash_profile: Autocomplete Grunt commands

Ref. https://github.com/gruntjs/grunt-cli#shell-tab-auto-completion
.functions: Print trailing newlines when not piping the output
Merge commit '7e824c8dd7010e558f319f73a7ffaf76f95a410f'

# By Mathias Bynens
# Via Mathias Bynens
* commit '7e824c8dd7010e558f319f73a7ffaf76f95a410f':
  .functions: Print trailing newlines when not piping the output
  .bash_profile: Autocomplete Grunt commands