used grep instead of sed to remove from history

quoted variable

Added remove command to readme

Added remove from history command

workaround to run functions and aliases

Added support for custom functions

fixed issue with = sign in alias

Update from ewancoder

Update README.md

Update README.md

Update README.md

create aliases and functions file if not exist

Added custom functions support thanks to https://bbs.archlinux.org/viewtopic.php?pid=1407087#p1407087

Create README.md

Create dmenu_fm