Overwrites ls alias

[solonovamax]

oh-my-bash currently overrides any aliases that has been set for ls, if /usr/bin/dircolors exists.

This happens because of lines 61 to 70 in $OSH/lib/bourne-shell.sh.

An alternative for this would be to do

if [ -x /usr/bin/dircolors ]; then
  test -r ~/.dircolors && eval "$(dircolors -b ~/.dircolors)" || eval "$(dircolors -b)"
  if ! alias ls >/dev/null 2>&1; then
    alias ls='ls --color=auto'
  fi
  #if ! alias dir >/dev/null 2>&1; then
  #  alias dir='dir --color=auto'
  #fi
  #if ! alias vdir; then
  #  alias vdir='vdir --color=auto'
  #fi

  if ! alias grep >/dev/null 2>&1; then
    alias grep='grep --color=auto'
  fi
  if ! alias fgrep >/dev/null 2>&1; then
    alias fgrep='fgrep --color=auto'
  fi
  if ! alias egrep >/dev/null 2>&1; then
    alias egrep='egrep --color=auto'
  fi
fi

This will only set the aliases if they don't already exist.

Will submit PR in a few.