[zsh] Override user settings in ~/Work

Taken from http://unix.stackexchange.com/a/42786
[zsh] Remove comment on how to disable weekly oh-my-zsh update checks
[zsh] Remove comment on disabling colors for ls
[zsh] Remove the npm plugin
[zsh] Reorganize the configuration file somewhat
[zsh] Capitalize the first letter in every comment
[zsh] Remove settings for Linux
[zsh] Remove beginning and end of line key bindings