New plugin 'common-aliases' for optional cutting edge zsh aliases

Signed-off-by: Gaetan Semet <gaetan@xeberon.net>
Merge branch 'gsemet_push_common_aliases' of https://github.com/Stibbons/oh-my-zsh into gsemet_push_common_aliases

Conflicts:
	plugins/common-aliases/common-aliases.plugin.zsh