Merge branch 'develop' of github.com:robinbowes/dotfiles into develop

* 'develop' of github.com:robinbowes/dotfiles:
  Enable more bash completion, if installed
Merge remote-tracking branch 'origin/master' into develop

* origin/master:
  Remove hd alias to hexdump as it classes with the history dump alias
  Really add the history commands
  Add bash history functions. and enable in .bashrc