correcting a few script problems

valet

@@ -1,7 +1,17 @@
 #!/usr/bin/env bash
 
-DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+SOURCE="${BASH_SOURCE[0]}"
 
+# Resolve possible symbolic link (http://stackoverflow.com/a/246128/416354)
+while [ -h "$SOURCE" ]; do # Resolve until we are no longer a symbolic link
+  DIR="$( cd -P "$( dirname "$SOURCE" )" && pwd )"
+  SOURCE="$(readlink "$SOURCE")"
+  [[ $SOURCE != /* ]] && SOURCE="$DIR/$SOURCE" # Resolve relative symbolic link
+done
+
+DIR="$( cd -P "$( dirname "$SOURCE" )" && pwd )"
+
+# Correct path if we are globally installed via Composer
 if [ ! -f "$DIR/cli/valet.php" ]
 then
     OLDPWD="$PWD"