make local-build embedable into .bashrc again

see #342

diff --git a/utils/local-build b/utils/local-build
index 4fd798d..9d92ea8 100755 (executable)
--- a/utils/local-build
+++ b/utils/local-build
@@ -12,7 +12,7 @@ fi
 
 [ -f composer.phar ] || curl -sS https://getcomposer.org/installer | php
 
-php composer.phar install
+[ -d vendor/ ] || php composer.phar install
 
 DIR=$(cd $(dirname ${BASH_SOURCE[0]}) && pwd)