Merge branch 'fix-lighthouse-error-message' of https://github.com/mortice/oh-my-zsh into mortice-fix-lighthouse-error-message

Use /etc/hosts in addtion to $HOME/.ssh/known_hosts as the source for
hostname completion

Turn on completion caching to speed up certain comands

When completing usernames, don't include system accounts by default

Theme based on clean that is more suitable for white background
terminals.
Signed-off-by: Brandon Philips <brandon@ifup.org>

On my linux virtual terminals, where TERM="linux", I was getting
annoying output that was messing up my prompt.

It turns out the title function was always matching on the elif
statement for xterm/rxvt no matter what and the linux vt doesn't know
what to do with the title special control sequence and thus was printing
out garbage.

Through experimentation I figured out that the || inside of the [[ ]]
did not work:

export TERM=linux
$ if [[ $TERM =~ "^xterm" || $TERM == "rxvt" ]]; then echo $TERM; fi
linux

$ if [[ $TERM =~ "^xterm" ]] || [[ $TERM == "rxvt" ]]; then echo $TERM; fi
Signed-off-by: Brandon Philips <brandon@ifup.org>

openSUSE running zsh 4.3.10