.vimrc: clear the search buffer easily
.zsh: invert images and containers cleanup in docker-cleanup(), so that old images can be removed after containers using them are removed
.zsh: reorganize aliases especially regarding MacOSX support
.zsh: add docker-images-shortlist() function to list only the names of local images
.zsh: remove useless comment
.zsh: add docker-lxc-attach() as a poor man's docker-ssh() until boot2docker supports nsenter/nsinit
.zsh: add gd alias for fast 'git diff'
.vimrc: highlight trailing spaces when not in insert mode

See http://vim.wikia.com/wiki/Highlight_unwanted_spaces
.vimrc: highlight non-breaking spaces

See https://wincent.com/blog/making-vim-highlight-suspicious-characters
See http://vim.wikia.com/wiki/Highlight_unwanted_spaces