Merge pull request #3055 from sachin21/remove_alias

This alias is conflict cause. 

lib/aliases.zsh

@@ -30,7 +30,6 @@ alias lsa='ls -lah'
 alias l='ls -lah'
 alias ll='ls -lh'
 alias la='ls -lAh'
-alias sl=ls # often screw this up
 
 alias afind='ack-grep -il'