Fixed BASH_IT path in fasd configuration to use environment variable instead of fixed path.
diff --git a/plugins/available/fasd.bash b/plugins/available/fasd.bash
index 643b54f..28a1246 100755
--- a/plugins/available/fasd.bash
+++ b/plugins/available/fasd.bash
@@ -584,7 +584,7 @@
 fasd --init env
 
 case $- in
-  *i*) alias fasd='~/.bash_it/plugins/enabled/fasd.bash'
+  *i*) alias fasd='$BASH_IT/plugins/enabled/fasd.bash'
        eval "$(fasd --init auto)"
       ;;
   *) # assume being executed as an executable